The gondolas let you glimpse a bird's-eye view of one of the world's highest capital cities.

These mammoth-yet-narrow crevasses in the Earth are perfect for taking an otherworldly swim.

A turquoise lake within a volcanic crater.

Gruesome statues of people reborn in Buddhist hell stand among the ruins of an 11th-century sanctuary.

Coast along one of Japan’s mountain railways for coveted views of magnificent hydrangeas.

Tiny memorials honor individual victims of the Holocaust.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A cluster of granite granaries perched on stilts.

The name of this ancient Indonesian temple translates as "Elephant Cave" but it could be more accurately called "The Hellmouth."

The second largest in the world, this massive underground void has its own subway.

Natural saunas fed by volcanic heat.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

An enormous, 30-story-deep hole in the middle of Guatemala City.

Hidden deep in the Guatemalan jungle is a turquoise paradise of natural pools, caves, and waterfalls.

The world's largest wooden trestle stretches across this desert canyon in Anza-Borrego Desert State Park.

A couple turned their front yard into an artistic masterpiece.

This historic tower in the California desert promises visitors a "vortex of good vibes".

Concrete crosses scattered across the Arizona scrubland which were used to align spy satellites.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

Lucha Libre (Mexican Wrestling) themed taco shop.

Semi-recognized center of the world, with many oddities.

Discovered after draining a local pond, these ancient man-made caves are still a complete mystery.

The world's oldest rose is so tough it survived being bombed in World War II.

Dedicated to improving the plight of the rare scaly anteater.