A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

A submerged archeological park still holds the wonders of a Roman Sodom.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Spiral alpine structure provides an alternative experience of viewing the Matterhorn.

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

A clear blue swimming hole with hidden caves, still unexplored.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

An ethereal glowing blue ocean cave in Croatia.

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

Stalactites and stalagmites in a beautifully lit cave.

An abandoned stretch of highway, deteriorating next to the operational one.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

Hear the quietest sound from across the dome.

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

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

The largest earthwork effigy in the world.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."