Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

Building owners can take out tiles for free at this repository for historic building materials.

Elaborate tile work in this railway station tells the story of Portugal.

Ancient catacombs form the foundation for this Rococo orgy of a church.

A hidden three-foot-wide house separates these two regal churches.

The stunning interior of this Gothic church is covered in ornate gold details.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Rippling sand dunes frozen in the Arizona rock.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

Dedicated to the armor and weapons used by the legendary Japanese warriors.

These tall, red sandstone pinnacles outside Moab are often forgotten amid their more famous neighbors.

Narrow slot canyons in a badland eroded into soft sedimentary rock provide an otherworldly landscape in this remote Nevada state park.