This blowhole is supposedly caused by a trapped monster.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This mansion oasis contains gardens, sculptures, and fountains just off the busy Plaça Kennedy in Sant Gervasi.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

This ancient Spanish castle sits high upon a hilltop.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

These markers are used to determine the ground stability of the Strip.

Fans of vintage Vegas, kitsch, and toy pony-based gambling now flock to a casino called The D.

An exotic wildlife habitat right off The Strip.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

Within this lovely Richmond cemetery lie the remains of famous Virginians and some of Edgar Allan Poe's most beloved family and friends.

Under a playground is a little-known sealed train tunnel that likely contains the bodies of workers trapped by cave-ins.

A convincing little bit of ancient Egypt smack dab in Richmond, Virginia.

At 207 feet, one of the world's longest continuous escalators.

Instead of faces, these sculptures have barcodes—statements on societal dehumanization.

A monument to the frontier doctor who came up with the idea of delineating highways with a painted line.

Head past the aisles of tropical fruit and imported candy at this bodega to discover a hidden, weekends-only taco stand.