A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A massive volcanic plug is now a protected area that hosts a number of bird species.

This quiet park's strange sedimentary spires were named after Kodak's color film.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

WWII-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers. .

Take a walk in a recreation of ancient Rome.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

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

The stones of this formerly witch-obsessed castle were used to build a church.

Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

Cold war icon and onetime "hole" in the iron curtain.

One of downtown Berlin's last reminders of its Communist past.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

A meteorite-bounded town in Bavaria.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

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

The great Danube river starts here.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

Berlin's old airport.

This unique Renaissance castle was turned into a home for Nazi occultism.

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