A park filled with vibrant mosaics created by more than 300 folk artists.

The only international border marker within the United States.

Civil War dumping ground for the bodies of terrorized Union sympathizers.

Once in disrepair, this popular Texas stop along iconic Route 66 has been restored to its past glory.

Over 100 million years ago, beach-bound dinosaurs left permanent marks on San Antonio's landscape.

Ruins of a once-opulent grand Victorian resort.

These boots are made for selfies.

A private collection of massive steel monsters guarding a Texas pipe works.

This former Texas landfill is flush with 300 million-year-old fossils, all fit for the taking.

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

The Grand Canyon of Texas.

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

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

An emerald-green grotto just a short trip from Austin.

These light, hollow rolls have been linked to Acadia National Park since the 1890s.

The whole of Maine's history with the salty little fish is packed into this tiny coastal museum.

A monument marks the beginning of the longest north-south road in the United States.

The largest tidal whirlpool in the Western Hemisphere.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

The eccentric mansion of one of the most popular horror authors of modern times.

Cliffs that hold fossils, including the earliest known reptile, dating back more than 300 million years.

Commemoration of a sea voyage gone mysteriously wrong.