One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Dozens of large, brightly-colored paintings adorn the walls of the "street art capital of Iceland."

This oceanside Reykjavik spot is speckled with recycled sculptures and large stones.

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

Walk in the footsteps of the gods and straddle two tectonic plates.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

Two stone columns flank the grand Venice square, but there were supposed to be three.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

The remains of a sunken military ship wreck visible through clear water.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

Gargoyle head that brings good luck.

The now-overgrown beach resort was once frequented by Yugoslav military elite.

The oldest arboretum on the Dalmatian coast doubles as the gardens of Kings Landing in "Game of Thrones."

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

This platform is now a memorial dedicated to those who were deported during the Holocaust.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

This unique structure allowed boats to bypass underwater mine barriers in the channel to enter the harbor.

This 1960's Soviet submarine in Peenemünde Harbor claims to be the largest submarine museum in the world.

This huge metal monument is slowly being stripped to its concrete skeleton.

Once a state-of-the-art tuberculosis treatment spa, these ruins are now ruled by paintball players.

This former estate of a fascist leader is now a burnt out ruin leading to a system of secret tunnels.