Legend says train robbers stashed their gold within the depths of this unusual cave.

The state bird of New Mexico, constructed entirely out of garbage.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

One of the last of the great 1920s movie palaces is a Floridian Greco-Spanish-Persian dreamscape.

The snowbirds here are circus sideshow performers.

This home is decked out like a psychedelic explosion of colors and bowling balls.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

One tiny triangular park commemorates the victims of a yellow fever epidemic—many of whom are buried right below the grass.

An eerie diorama that captures the majestic nature of a few prehistoric-looking beasts.

This poignant display is now a memorial to these regionally extinct species.

One of the most dazzling dioramas at the American Museum of Natural History is also one of the oldest.

This morbid scene depicts the Darwinian drama of death on the African savannah.

This impressive scene portrays the elusive forest giraffe of Central Africa.

This magnificent herd of stampeding elephants has been frozen in time for over a century.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

A decommissioned military complex that's now a modern industrial park.

The oldest volcanology research center in the world.

A narrow opening between the mountains of the Amalfi Coast creates a scenic hidden beach.

This tremendous timepiece was once the largest cuckoo clock in the world.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

A climbing route in the mountains of Italy’s Dolomites, built for soldiers during World War I.