A colorful architectural gem in Seattle’s uniquely modern Central Library.

A startling, centuries-old subterranean marvel hides in plain sight.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Colloquially known as “piss alley,” this narrow street filled with tiny bars and barbecue stands looks like it was pulled straight out of “Blade Runner.”

Peace Park and the Atomic Bomb Dome.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

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

A multiversal transit station located right below a highway interchange.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A small store filled with animal skulls and other curiosities.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

A downtown park built on top of unclaimed graves.

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A sharp bend in a dramatic river canyon cut through red rocks.

Most-visited and most-photographed slot canyon in the American Southwest.

10,000 flowered plants bloom in the City of Roses.

Ghost stories surrounded this “castle,” the only structure from a huge mansion that was never built.

This lovely university observatory continues to sit abandoned since its potential savior was sent to jail for fraud.