A barbarous band of serpents guard the bases of these Aztec temples.

A former bank seized as a sniper vantage point during the Bosnian War is now a secret graffiti art gallery.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A winding path built in secret on the edge of the continent.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

The F1 Mexican Grand Prix circuit goes right through the middle of this old baseball stadium.

The jewel of western Mexico's archaeological legacy is this tiered circular pyramid now covered in grass.

The only castle in North America to ever house European sovereigns.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

North America's largest accredited model railroad museum.

The wooden airship was the largest flying boat ever built.

These layered sandstone mountains in China look like they are made of pressed crayons.

The world's longest outdoor escalator takes visitors to the top of China's largest dam and is also shaped like a dragon.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

Iconic rock formations that allow for exploration during high or low tide.

Single runway interrupted by a busy road that cuts across its middle.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

Nature's biggest mammal swims in landlocked Oklahoma.