Site of a classic 19th-century physics experiment to prove the earth is rotating.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

This restored house is like a time capsule of the president's unconventional inauguration.

Planned as the world’s first zero-carbon city, it had lofty ideals—but is only 5 percent completed and aiming for 50 percent carbon-neutral.

Whitewashed mosque contains the world's largest carpet.

The childhood home of America’s first winner of the Nobel Prize in Literature.

A century-old landmark that once employed Sinclair Lewis and is still known for its ghost stories.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Climb inside an iron crystal magnified 165 billion times its normal size.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

A haunting museum chronicling the bloodiest battlefield of World War I.

In 1977, an eccentric book lover formed a micronation for book lovers.

This memorial to World War II's fallen airmen shows us the movements of the stars that once guided them.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

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

A collection of 20th-century automata, penny arcade games, and musical contraptions.

This tiny island is recognized as the site where St. Paul landed after a shipwreck in the first century.

This is the spot where the bloodiest battle in the American Civil War may have started.

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

Elevated freight railway turned wildly successful urban park.

Herman Melville wrote 'Moby Dick' in this landmark 18th-century house surrounded by farmland.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

The home of president Truman during the Potsdam Conference, and the place from which the atomic bomb strike on Japan was triggered.