A hidden three-foot-wide house separates these two regal churches.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

You can cross from one country to another in a single hop on this little bridge.

Order cookies baked by cloistered nuns in a 400-year-old monastery.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

A beautiful example of 18th-century engineering still standing tall.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

The unique collection often goes unnoticed by visitors focused only on the archaeological objects.

This colossal ancient sculpture of the monstrous Aztec rain god has a literally stormy history.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

This lucky bronze frog was gifted to Madrid by a casino.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

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

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.