A Nazi concentration camp and Anne Frank's place of death.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

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

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Perhaps the most scandalous statue of America's first president.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

Frida Kahlo's childhood home, now a museum of her life and works.

66,000 pieces of art, donated by one of the world's richest men.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Every week, a festive public jam session breaks out in downtown Asheville.

Practice your Dirty Dancing lifts in the manmade lake where Johnny Castle himself did.

This historic cemetery built for victims of the epidemics that swept Guadalajara is shrouded in macabre tales.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.