A strange aquarium with stuffed fish, and almost no water for them to swim in.

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

Some of the clearest water anywhere in the world.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

Hot springs monkey spa in the middle of Hell's Valley.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

Most-visited and most-photographed slot canyon in the American Southwest.

Rippling sand dunes frozen in the Arizona rock.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

This mesmerizing architectural wonder will take your breath away with its unusual color patterns.

The remains of a 37,000-year-old prehistoric society were discovered in this mammoth cave, one of the largest in Asia.

One of the few places where inexperienced snorkelers can spot a shark.

According to Hindu belief, this shallow island chain was created by a god with an army of monkeys.

Huge herds of Asian elephants can be seen walking, bathing, and just chilling at this Sri Lankan park.

An ancient stone fortress considered by many to be the eighth wonder of the world.