This groundbreaking 16th-century map is known as "America's birth certificate."

This unique rock formation has become a popular walking trail.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

The ruins of a resort and casino sit on the banks of this blue hole spring that pumps 70,000 gallons of warm, clear water every minute.

Walk down these stairs to get an underwater view of Switzerland's Lake Zug.

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

The best-preserved beehive tombs in Oman with spectacular backdrop.

After 400 years of being closed to the public, this monastery's underground tunnels and secret garden are now a museum.

The tallest mud-brick structure in the world has been standing since the 1500s.

Drink the 'Blood of Christ' in this Roman Catholic fever dream.

An ancient cave system in Tennessee’s Appalachian foothills converted to a 1,200-person music venue.

This gem of Moorish architecture is slowly disintegrating along the coast of this charming town.

Owned by Native American women, this brewery is a celebration of indigenous culture in the American Southwest.

Organisms normally seen under a microscope decorate this church.

The city's oldest Chinese restaurant offers local history and seriously good food.

The damming of the Colorado River buried an iconic geologic formation before record-breaking drought brought it back.

An eccentric millionaire's personal curio collection includes at least one shrunken head.

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.

This mother-daughter run curiosities shop is a beautifully odd mix of taxidermy and exotic plants.

A set of tall pillars and alcove-like rooms that are significant to the Miami people of Indiana.

What began as a prominent Burning Man art piece is now an iconic symbol of downtown Reno.

In the middle of a remote desert town is a surprisingly opulent hotel.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

St. Francesca Romana, patron saint of drivers, resides in the church she founded.