Terrifying derelict military hospital once housed a recuperating Hitler.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

The oldest housing complex in Riga is a mini timeline of architectural trends.

This lakeside bunker complex in Mamerki, Poland, housed the Supreme Military Command of Nazi Germany during World War II.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

This abandoned office building is a lasting example of Soviet-era architecture.

A memorial to the murdered Jews of Kaunas.

The legendary birthplace of the Japanese maneki-neko is dotted with hundreds of lucky beckoning cats.

Colloquially known as “piss alley,” this narrow street filled with tiny bars and barbecue stands looks like it was pulled straight out of “Blade Runner.”

Not quite the menace it once was, this monster still has some chops.

An unexpected curiosity cabinet hidden within a department store in the Japan Post tower.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

This endearingly discomfited urinating statue commemorates the sneaky pees had by us all.

Architecturally stunning library serves as the hub of Finnish scholarly life and culture.

A subterranean house of worship carved right out of the bedrock.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

This man-made mound monument was built out of soil from all across the Polish empire.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

Monumental sculptures guard many of the graves, transforming this necropolis into an open-air fine art museum.

Over time, this castle grew to encompass the entire island.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.