This question is hard to answer since you would have to define "in use" very precisely. Here are some wild guesses:
Wikipedia has a list of the oldest buildings in the world. Prominently feature tombs/graves/similar and you could well argue they are still in use. That would go back as far as very roughly 4000 B.C.
Stonehenge is believed to have been ...
It is Aiguille du Midi station near to Mont Blanc, accessed from Chamonix in the French Alps, department Haute-Savoie. (See it on Google Maps)
Photo from http://geo.hmg.inpg.fr/mto/jpegs/inventaire.html under CC-BY-SA
It's the top station of the Aiguille du Midi cable car, and also one of the two end points of the Panoramic Mont-Blanc gondola, which runs ...
This is the Kalantarov's house from the early 20th century. The exact address is 27 Lado Asatiani Street , in the Sololaki district, just under Sololaki mountain where Narikhala stands. The closest underground station is Tavisuplebis Moedani.
It was designed by architect K.A. Sarkisyan and built in 1908 for Michail Kalantarov, a rich merchant living in ...
There are no such temples in Saudi Arabia - source: 26+ years of living there.
There are way more Christians in Saudi Arabia than Buddhists - but there are no churches in Saudi Arabia either.
It is enshrined in the law - which states that all people are free to practice their religion in private only. Public houses of worship for other religions are not ...
Well tineye.com got a few hits but nothing to solve the problem...
But Google Image Search using your photo as the search parameter was more helpful.
One of the many hits was to a blog called The Sticky Egg, specifically the post from November 13 2011 called "Feeling Bookish", which includes an address:
De Batavier in Lootstraat [sic], Amsterdam.
I've never seen this place myself, nor heard about it before today, but after some research online, I'm fairly certain this is Segovia in Spain.
Above is a picture of the same city from a slightly different angle. (Image credit Carlos Delgado, Original at Wikimedia Commons)
The big church in the middle is the Segovia cathedral . The small church in the ...
It's on the northwest tower of the Washington National Cathedral in Washington, DC. There's an informative page about it on the cathedral's website:
You can see it from ground level, but they advise binoculars.
As for why it's there:
Washington National Cathedral held a decorative sculpture competition for children... The
third-place winner was ...
You have several possibilities for a picnic on a normal day (as Gayot Fow's answer mentions, the white picnic is worth the trip as well).
The first one is where everyone goes, particularly tourists - namely around the Grand Canal. I would not say that you need to "reserve" your spot but some places get crowded.
A picture I took in May, on a Sunday, from ...
This is the sort of waffle that marketing people are very good at generating. It is positive in all the right ways, and negative in all the right ways. It's clever.
Is it catchy? Yes.
Is it carefully modest? Yes. (Note that it's not the MOST photographed.)
Is it a slogan? Yes.
Is it possible to disprove? No/unlikely.
Are people likely to question it? No. (...
There are a great many locations on the Great Wall that can be visited. The most common start point if from Beijing, however, I would disagree with the answer by Mark Mayo in that they are not all over crowded with tourists. Most tours head to the section along Badaling, near Beijing, and that is the bit to avoid. Though again, if timed right and going off ...
I am willing to contest the basic premise: despite several claims online, I won't accept that this train station is the second most photographed building in the southern hemisphere. That said, perhaps it depends on how you stretch the definition of 'building'.
Not exactly scientific, but hard numbers nonetheless, I searched Flickr for...
"machu picchu": ...
It is the Palace of the Parliament in Bucharest, Romania (some more photos).
As to whether it's the biggest building in the world, Wikipedia says:
According to the World Records Academy, the Palace is the world's
largest civilian building, most expensive administrative building, and
But see also the list of largest buildings in ...
Well this list has an index to ALL the Wikipedia pages for lighthouses in the world.
I'll ignore lightvessels for this question.
For European countries:
Belgium - 6
Bulgaria - 5
Denmark - 6
Estonia - 42
Finland - 9
France - several
Wales - 25ish
Scotland - tons
Portugal - 44 continental, more in Azores
Spain - tons
Sweden - 20ish
England - 50ish
Norway - ...
I also find it incredibly difficult to search for a lot of things in Japan, especially in English on Google. Having the exact Japanese name and address makes things easier.
This tower is actually not a "Castle" but rather a "castle style tower". It is an observation/look-out tower.
Here is the address:
〒981-0213 Miyagi-ken, Miyagi-gun, ...
It is an apartment complex built on the waterfront of Aarhus in Denmark.
Isbjerget was created in a collaboration between four architectural
firms: JDS, CEBRA, SeARCH, and Louis Paillard. It took 5 years for the
project to be completed, and is one of the first projects to be
completed within De Bynære Havnearealer, the new docklands quarter of
That is the Teatro Fausto, on the corner of Prado and Colon, in Havana Cuba. The "ants" you see in the photo were an artist's exhibit in 2012 for the Havana Biennial. They are no longer on the building.
I found someone who knows. One of the residents of Villamayor de Monjardín was three years old when it was built in 1948. It was a gravity water tower that has since been replaced by pumps.
There is a spring on Montejurra, a mountain some distance away. They actually ran pipes down into the valley and up this hill to a tank that is no longer in or on the ...
The Great Pyramid of Giza initially had two functions, to serve as a tomb for the pharaoh, and to demonstrate his power and prestige. Today, it has two functions, to serve as a tourist attraction and to demonstrate the power and prestige of the pharaohs. It is a structure that has continuously fulfilled one of its functions since 2540 BC.
As far as I know, ...
Yes, that is Cittadella, province of Padua, Italy
and aerial view picture:
another view picture
it is really easy to spot since you can read clearly the
domus dei et porta coeli
meaning house of God and heavens door! in the main square church
For general communist architecture I would start at Alexander Platz and walk down the 'Karl-Marx-Allee' all the way to 'Frankfurter Tor' in Friedrichshain. There is nothing super special there, but the street was used for the big parades and still has a bit of an 'East German' feeling to it.
As for bunkers, there are still many around, some of them from the ...
This is Sun City Resort in South Africa, opened in 1979, specifically it's the Palace of the Lost City.
There's some apartheid-era history to it (thanks @Andrew Grimm) but it's still open today.
You can use a service like TinEye or Google image search to search for pictures like this on the Internet, then from there look for captions or any relevant text ...
Are there any current major Finnish cities where the architecture is medieval, or at least "pre modern" (before the late 1600s)?
In short, no. Compared to most countries in central and southern Europe, Finland has very few remaining medieval buildings (or indeed buildings older than 100-200 years, sadly). Most buildings back then were wooden (and primitive) ...
Well there were actually several stages of the wall, and it's now in various states of disrepair / ruin depending on where you go. Presumably you want to go where there's actually wall, as opposed to rubble.
One of the most common routes is ex-Beijing, but since you want less crowded, we'll skip that.
For something quite cool and different, try Shanhaiguan ...