The United States Capitol's former columns still stand.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A huge musical instrument played by the ocean.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

This famous city eluded concrete detection until the early 2000's.

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

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

This gallery of prehistoric red ochre art lines the wall of a scenic segment in Utah's San Rafael Swell.

A spectacular overlook of the Little Grand Canyon of the San Rafael River, a deep sandstone gorge streaked with orange, red and white in a remote, uncrowded part of Utah.

The Giant Lemon of Lemon Grove.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Try not to get slimed in Tribeca.

A giant Troll lurks under one of Seattle's oldest bridges.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

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

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

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

This large, circular tomb is the final resting place of the first emperor of Rome.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

This quiet park's strange sedimentary spires were named after Kodak's color film.

A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.

Despite its name, this route in southern Utah offers a heavenly day trip.