This freshwater spring fills with 10,000 gallons of water per minute.

These dramatic cola-colored falls have appeared in a poem by Henry Wadsworth Longfellow and a song by Sufjan Stevens.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

This shallow cave got its name from copious amount of human bones found inside.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Where the White Nile River dramatically cascades between Lake Kyoga and Lake Albert in Uganda.

Singapore's landscaping project is home to 18 incredible Supertrees.

The highest pedestrian bridge in Singapore looks like a series of undulating waves rising between two public parks.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

The oldest bakkwa shop in Singapore is especially beloved during the Lunar New Year festivities.

The largest United States military cemetery overseas.

This former stomping grounds of the most eminent astronomers of the early 20th century.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

One of the ghostly stops along Route 66.

This bizarre hotel on historic Route 66 has been plagued by rumors of paranormal activity.

A collection of anti-communist sculptures stands watch in the Mojave Desert.

Fans of the spicy bright-red sauce can tour where it's made.

“It's the quality” (but probably also the drive-through donut tunnel) that has attracted diners since 1968.

The set location for a 1987 cult classic draws international film buffs to the middle of the Mojave Desert.

Try the frozen treat that inspired Arrested Development's famous banana stand.

Hundreds of trees made from glass bottles make up this forest on Route 66.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

Oldest building in California still in use.

The last Americana on Route 66.