Did Gustav Eiffel design this enigmatic metal building?

Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.

Mount Nyiragongo has erupted at least 34 times since 1882 and is home to the world's largest lava lake.

A mountain range on an active U.S. Navy base hides thousands of mysterious prehistoric rock carvings.

These ancient giraffes are the largest known animal petroglyphs in the world.

An abandoned meat mecca now serves as an excellent locale for urban exploration.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

This unique bird reserve sits within an important fragment of Brazil's Atlantic rainforest.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

Divers can encounter an abandoned warship encircled by a giant kraken submerged in the British Virgin Islands.

A massive ultra-modern church presents a science-fiction view of Catholicism's inclusive future.

Named for the DeFoe novel inspired by a stranded sailor, this island is known for its rare plants and extreme beauty.

Siberian whale bones stand as cairns marking location of an ancient butcher yard.

Abandoned outpost once home to a murderous tyrant.

Island of trash twice the size of Texas floats in the Pacific.

The world's largest aggregation of great white sharks is at a mysterious spot in the middle of the ocean.

These circular ruins are all that remain of a 17th-century Arctic whaling outpost.

The third-largest island in Canada is one of the remotest places on Earth.

A long-disputed island that Denmark and Canada claim by periodically alternating flags and bottles of liquor.

This abandoned Antarctic research station is a Soviet ghost frozen in time.

Drink and dine in a coral cave that's at least 120,000 years old.

Stay in your own little bubble.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."