Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

A naturally mummified 2,000-year-old man.

A replica of the steam engine that hauled Queen Victoria's Royal Train is on display at Windsor.

At just 51 feet and 10 inches long, it's the shortest street in England.

Ornate limestone building now filled with geologic specimens, and more.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

A former major munitions plant that has been converted into a sprawling art space.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

Home to items never before seen by the public.

This frozen tunnel in central Alaska is both an engineering feat and a valuable climate classroom.

North America's first frozen mummified remains of an ice age steppe bison, the 36,000 year-old mummy named "Blue Babe."

Few other hotels can rival the grandeur of the Castle in the Rockies.

Climb to the top of the world's largest seated bronze Buddha.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Taoism, Buddhist and Confucianism are all represented in this temple that claims to answer anyone's wishes.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

This striking art museum holds an amazing series of curiosity cabinets.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.