A 300-ship graveyard, with a few still visible at low tide.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A winding path built in secret on the edge of the continent.

The second oldest Jewish graveyard in the U.S. is tiny, with connections to George Washington and Henry Wadsworth Longfellow.

Cryptic messages embedded in the New York City sidewalk.

Amid the marketing blitz of modern Times Square is an elegant holdover from its showbiz glory days.

An annual extravaganza of Broadway theater memorabilia.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Spike Lee's provocative film is officially honored right where it was made, the first time a work of art was used as a secondary street name.

The famous facade of Grand Central Terminal hides a regulation tennis court—and it's not the first one.

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

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

Read a book next to a Midtown waterfall.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

This scenic gorge is named after one of the most famous Bigfoot attacks in pseudohistory.

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

Sniff the Titan Arum's rotting flesh.

Dedicated to preserving the history of free Black communities in Brooklyn and beyond.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

Millions of dollars worth of sculpture decorate this Iowa city center.

A mysterious castle built as a monument to lost love.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.