The ominously named cave is home to some remarkable ancient art.

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

A unique set of caves that spits waves back out into the ocean.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

A sculpture of a giant man escaping from the depths of the Earth.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

This World War II-era bunker is now packed with posters and props from movies and TV shows filmed nearby.

Dozens of large-scale, creative, evocative curios from prominent artists dot the calm outdoor space around this major museum.

From a distance, this statue of an eagle looks like a giant chicken on a stick.

This legendary urban waterfall creates a dazzling display of rainbows.

A genuine Tudor manor transported piece by piece from England.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

This natural hill rose another 130 feet from the debris and rubble added after World War II.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

This blowhole is supposedly caused by a trapped monster.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

High winds can make this one scary landing.

Taihape's claim to fame is a fictional Kiwi farmer wearing gumboots.