Jurassic Park—A Still Life.

This geothermal hot spring hides beneath a slowly growing mineral dome.

This iconic 1958 tower welcomes air travelers to Tucson with neon-lit letters and architectural style.

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.

Most-visited and most-photographed slot canyon in the American Southwest.

This underwater old Texas hill town only resurfaces during harsh drought.

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

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

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

A collection of 100 brains preserved in jars on the UT campus.

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

The second-deepest known cave on Earth, hidden in an extremely remote mountain region.

Crumbling remnant of Rio's colonial past tucked behind Corcovado mountain in the neighborhood of Cosme Velho.

Berry Gordy Jr.'s old home was the original headquarters of Motown Record Corporation.

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."

This 220-year-old house is a reminder of New York City's Dutch past.

What happens here stays here – unless it affects the whole world.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

You can spend the night in Dr. Frank-N-Furter's castle.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.