One of the oldest living oak trees in the Southeast.

The Grand Canyon of Texas.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

The highest bridge in America was built for an almost unnervingly small amount of money.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Famously misunderstood wonder of the ancient world

A modernist landscape of water and sci-fi concrete.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The world's longest known cave system.

Eighty million natural history specimens call this gargantuan museum home.

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.

The oldest stone house in Paris was built by its most famous alchemist.

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

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Elevated freight railway turned wildly successful urban park.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A secret hatch containing two parchments was discovered in this statue over 40 years after its installation.