The long way around:
It may be possible to get to Israel overland from Europe via a ridiculously circuitous route that avoids the current (2016) trouble spots in Syria, Iraq, Libya, and Saharan Africa. The first step is to get to Iran, by one of the following routes:
- From mainland Europe to Turkey, thence west to Iran, crossing the border into Iran either near Gürbalak, Kapiköy, or Esendere.
Note that as of this writing (July 2016), the U.S. State department does not recommend travel to southeastern Turkey, which would eliminate the second and third of these border crossings. If you wish to avoid Turkey altogether, you could also enter via Azerbaijan:
- From mainland Europe to Russia, and south into the Dagestan region of Russia.
- Cross into Azerbaijan and continue south.
- Cross the border into Iran, either at Astara or Bilasuvar.
Once you have done this:
- Take a ferry across the Persian Gulf. Three useful routes exist. The Bandar Lengeh–Dubai and Bandar Abbas–Sharjah routes will deposit you in the UAE. There is also a ferry from Khorramshahr to Kuwait City, though it is passenger only and you will need a vehicle for the next step.
- Obtain a driving transit visa for Saudi Arabia, and drive from the UAE to Jordan (and thence to Israel.)
I am honestly not sure whether this is actually possible. The two steps that I have italicized above may be problematic, depending on one's citizenship. Also, you might have to be cagey with various border officials in Iran, UAE, and Saudi Arabia about what your final destination is. There's the issue of whether you could successfully bring a vehicle along with you the whole way; without that, one would have to rely on long-distance buses, which I suspect would be difficult (particularly in Saudi Arabia.) And given the current state of relations between Saudi Arabia & Iran, it may be difficult to get a Saudi transit visa after visiting Iran.
I don't expect that anyone would actually do this; I was just amused that it might actually be possible.