One of the best places to see wild Colonial Spanish Mustangs in the United States.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

A secret, ethereal waterfall beneath the picturesque gardens.

Four-story concrete hotel never opened to customers.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The historic home still shows the scars from a little run-in with the British in 1813.

Gustave Eiffel's masterpiece until the Eiffel Tower was built.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

An icon of the Battle of Britain is frozen in flight in a grand Victorian museum.

Start your morning off with an epic food crawl in this market east of Oaxaca’s historic center.

An incredible collection of Mesoamerican art assembled by one of Mexico's great artists.

A 16th-century monastery boasts a lush array of plants native to Mexico’s most biodiverse region.

In a busy Oaxaca market, a nearly century-old drinks stand still serves family recipes from giant clay pots.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

Glasgow's oldest pub has a proud literary tradition and possibly a ghost or two.

Dine like an American revolutionary at Colonial Williamsburg.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

The only sea in the world that has no land boundary.

An almost life-sized elephant named Ms. Ellie greets visitors at this jumbo-themed museum.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.