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The first American department store, and home to the largest operating musical instrument in the world.

The oldest surviving botanic garden in the United States.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

The Tudor-style cottage in the middle of the square is not quite what it seems.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

A cluttered and astounding collection of antiquities and curiosities.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The world’s first penitentiary, meant to be humane, drove men insane.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

This Old Testament garden features 100 plants from biblical times.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Legend says this sacred tree was a gift from goddess Athena.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.