Prehistoric animals decorate this popular outdoor park.

The world's longest known cave system.

This Transylvania County city is home to a rare white squirrel population that is descended from an escaped carnival animal.

Mile-long cave system near Great Smoky Mountains.

This replica of the Greek structure is in the heart of Nashville.

Watch the newest land on the planet form before your eyes.

This black shoreline is made up of exploded lava particles.

Death road of Bolivia.

The Uros people live on floating reed islands in lake Titicaca.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

A valley of unique erosion patterns lends to a view like nothing on Earth.

Popular tourist destination where witches in dark hats sell dried llama fetuses for good luck.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

360° views of the city plus five floors of optical illusions and hands-on science.

The biggest solar telescope in the world helps reveal the secrets of our sun.

A bright little alley in La Boca is a part of tango history.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

The fairy tale castle of the "fairy-tale king."

Four cars from the old system were once on display, but were removed in 2014.

An illegally built ramshackle mansion tucked in the middle of Brooklyn is now being turned into condominiums.

There's a piece of New York City transportation history hidden in plain sight at a Manhattan subway stop.