The longest-covered bridge in the state of Maryland.

Pennsylvania's own Roswell-style UFO mystery.

This is the last hand-cranked chain ferry of its kind in operation in the United States.

In this quiet park a rendition of a classic painting graces the outside of a charming restroom.

Perched atop a brick smokestack, this enormous lug nut symbolizes the local minor league baseball team.

Largely unknown designer of the Jefferson nickel, one of the most iconic coins in U.S. history.

The writing studio of an American adventure author, built in the style of a medieval castle.

Northern Virginia’s iconic Vietnamese shopping center.

An architectural oddity hides in plain sight on this iconic London bridge.

No one really knows how these old hobby horses got here, but the herd keeps growing.

A 19th-century politician who died after walking home in a blizzard is honored with this Manhattan statue.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

A vibrant, 100-foot-tall mural dedicated to Evelyn Nesbit, the tragic icon of the Gilded Age.

The one-time epicenter of American songwriting is now a little remembered Manhattan commercial block.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

Seriously good slices of Sicilian pizza lurk at the back of the Bronx's oldest enclosed market.

The mosaic Star of David at the front of this store hints that it's no ordinary Italian grocer.

A small graveyard is hidden in the midst of a bustling university campus.

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

Twelve decommissioned shipping containers evoke a reclining person in Marfa, Texas.

A Prada store in the West Texas desert that is never open for business.

This old abandoned sign flickers to announce a motel that isn't even there.

Larger-than-life cut-out murals of James Dean and Elizabeth Taylor, dedicated to their 1956 film ‘Giant.’

A sculpture made of 10 Cadillacs as a monument to the “Golden Age” of the American automobile.