Gorgeous purple flowers drape from the world's largest blossoming plant.

Hear the quietest sound from across the dome.

17th century mosque for Shah Abbas' harem.

The walls of the iconic dome are hollow and have a secret stairway.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

This giant Buddha statue has 125,000 smaller Buddhas hidden inside it.

Climb right into the heart of this colorful Iceland volcano.

Tubing through a cave lit with glowworms is a magical underground experience.

A fifth-century temple improbably built into the side of a cliff.

Sleep in a glass pod dangling off a cliff.

This abandoned, turn-of-the-century astronomy hub is now the subject of more photographs than it ever took.

The Atlantis of Cape Cod reemerges during the lowest of tides.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

Featured in one of the most iconic scenes in cinema history.

Sometimes an island, sometimes a rocky outcropping connected to the world by a tiny suspension bridge.

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

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

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

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

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

This modest marker near Notre Dame identifies the very center of Paris.

Home to 23 voluptuous and instantly lovable sculptures by one of Latin America's most celebrated artists.

This magnificent blue mosque in Afghanistan is surrounded by thousands of white doves.