Ancient ruins hidden underneath a modern luxury hotel.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

A portable, wooden replica (minus the hyphen) of Hamburg’s iconic crooked coffee shop.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

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

The bridge that cost Germany a World Heritage Site.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

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

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

The Forest Service's surprisingly sophisticated collection of wildfire prevention art features America's most beloved bear.

Dedicated to a U.S. Army lieutenant colonel who was also a bird watcher and artist.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

A massive, majestic mammal watches over pedestrians from his perch atop a former B.P.O.E. lodge.

Once the largest trading firm of enslaved people in the U.S., this building is now a museum that preserves Alexandria's dark past.

The only place for a truly presidential dram.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

A work of art that pays homage to a Victorian timepiece in Providence.

A giant green dragon crawls down from the roof of the Providence Children's Museum.