An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

An exquisite collection of fairytale conveyances that puts most car museums to shame.

Entire apothecaries are on display at this Lisbon museum, which explores the history of medicine.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

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

An abandoned tuberculosis hospital said to be haunted by the patients who died within its walls.

This historic streetcar system has been running since the 19th-century.

This giant sculpture made of trash is a critique of society's wastefulness.

This tower once served as a radar station during the Cold War.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

The world's oldest bookshop still in operation.

A wacky, UFO-shaped house in a suburban neighborhood.

This Texas windmill field celebrates the power and majesty of the very winds that blow.

The only ski tunnel in North America provides easy access to amazing snow and beautiful views.

A replica that won't float away.

A cave's rare beauty held a cavernous secret hidden underground.

More than 21,000 images fill this overlooked gem of a prehistoric site.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A somber monument commemorates the site of a Native American reservation marked by suffering.

This sculpture is intended to reset a person’s creativity.

The final resting place of the living embodiment of the famous Forest Service symbol.

In a largely deserted ghost town, a little brick building recalls its history as a gold rush hub and haven for outlaws.