America's post-nuclear-attack chambers of Congress.

The "Prussian Versailles" that is as glorious today as when it was built.

Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

This East German military command bunker was ready for World War III.

An eerie, derelict amusement park in Berlin.

Berlin's old airport.

When German-Iraqi relations broke down, this embassy was vacated post haste.

Floating swimming pool within a moored vessel.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

The largest treasure hoard in Europe is contained in a castle that was bombed out during World War II.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

This museum was invented in a novel before being made real by the author.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

A working miniature city designed to teach kids about safety and presumably city planning.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Largest island in the Baltic Sea experiences such idyllic weather that roses bloom in the middle of December.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

Looming communist pillar with a Czech twist.

A beautiful and classically designed villa, with an hourly infestation of monsters.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.