In Monsanto, just next to Lisbon there are a couple of abandoned buildings. Monsanto is a small mountain just next to Lisbon. It's considered the lung of the city. Through the years many things were built and for some reason abandoned.

One is the panoramic restaurant: https://www.youtube.com/watch?v=iizRWg-jNYc

Also, there was aquaparque. A slide water park that was abandoned after an accident. I think this one is closed though, and there are plans to make a garden there. I am not sure if construction restarted.

https://www.google.nl/search?q=parque+aquatico+monsanto&biw=1855&bih=1045&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjcyPT7zIbNAhUnB8AKHf64AmEQ_AUIBigB#imgrc=8u-wmqS_TB6r1M%3A

But there are more. Just google for abandonado serra monsanto

In Monsanto, just next to Lisbon there are a couple of abandoned buildings.

Monsanto is a small mountain just next to Lisbon. It's considered the lung of the city and it's covered with pinetrees. Through the years many things were built here and there and than, for some reason abandoned.

One is the panoramic restaurant: https://www.youtube.com/watch?v=iizRWg-jNYc - It's in a very nice spot with a great view over Tagus river.

Also, there was aquaparque. A slide water park that was abandoned after an accident. I think this one is closed though, and there are plans to make a garden there. I am not sure if construction restarted.

https://www.google.nl/search?q=parque+aquatico+monsanto&biw=1855&bih=1045&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjcyPT7zIbNAhUnB8AKHf64AmEQ_AUIBigB#imgrc=8u-wmqS_TB6r1M%3A

But there are more. Just google for "abandonado serra monsanto"

A couple of kms south of Lisbon you have this building:

http://3vilas.com/wp-content/uploads/2013/11/palacio-rei-do-lixo.jpg

It's called tower of hell, or palace of the garbage king. It's in Coina.