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

This beautiful grotto is one of those places where you can't believe you're just outside Austin.

A popular swimming hole that hides one of America's most deadly diving spots.

A Texas landowner spelled out his name with three miles of trees, a giant signature that's been used by NASA to evaluate satellite imagery.

A medieval castle in the middle of rural Texas.

In the late 1990s, a mechanic and fan bought this iconic sportscar back from the dead.

There is an unmarked red button hidden over Houston's Buffalo Bayou that is just begging to pushed...

The largest underground pedestrian tunnel system in the U.S. mostly caters to the people working in the offices above, but provides a great, air-conditioned way to traverse the city.

A 90-year-old underground water reservoir offers a more industrial kind of tranquility.

Artist James Turrell's ode to dawn and dusk on the campus of Rice University.

This small park features a monumental fountain wall, providing a great photo opportunity in the middle of Houston.

A curious statue fit for a mad tea party.

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

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

This huge repository of local history housed in an old J.C.Penney's is home to the largest model train set in Southeast Texas.

This tiny, hurricane-resistant house in Galveston is one of the city's most notable architectural oddities.

This memorial marks the devastating day that Texas City was destroyed in a daisy chain of exploding ships.

This glass skywalk offers vertiginous views down the volcanic cliffs to the beach below.

A pre-Hispanic pyramid in the middle of a tourist district in the Canary Islands.

Marvel at this massive waterspout fueled by the incoming tide.

Volcanic rocks ground down into sand make this Spanish beach as black as night.

Behind this pair of dragon trees, there is a tragic story of lost love.

A former 16th-century monastery houses a museum dedicated to the island and its culture.

This replica of Columbus's famous ship houses the history of La Palma's maritime importance during the Age of Exploration.