This ancient limestone cave system contains many impressive geological features.

The third-tallest lighthouse in the United States stands as a reminder of Atlantic City's early days.

The site of the Andover Witch Hunts, which ended with more witch accusations and arrests than Salem.

Inside the Bangor International Airport is a collection of military challenge coins.

This museum covers 10,000 years of Pre-Columbian Latin American history.

The largest cemetery in Chile is the final resting place for more than 2 million people, from politicians to artists.

Though it's no longer a functioning train depot, this castle-like structure is an important piece of Oklahoma history.

The oldest tofu shop in the United States is a firm favorite with locals.

Private collection of art inspired by cabinets of curiosity.

The ruins of a sixth-century monastery sit on the banks of the River Shannon.

This miniature museum is home to a vast array of insects.

A unique collection of more than 250 rocks and minerals located on a university campus.

Deep into the lower floors of Pike Place, find a date with fowl fate.

This sinkhole in the Arizona desert is filled with carbonated, arsenic-rich water

It's believed this well was once plagued with evil spirits until St. Columba purified the water.

Some believe that the stone once used to coronate Scottish kings resides inside this bar.

This airfield played a key role in both World War II and the Cold War.

The ruins of a monastery that dates to the 7th century.

The final resting place of an iconic drag performer is decorated with pearls and hot-pink lipstick.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

At the most northwestern point of the contiguous United States lies a trail leading through an ancient forest to stunning cliff-side vistas and massive oceanside caves.

This cathedral's stained-glass patchwork of psychedelic colors and shapes was put in place long before the swinging 60s.

Near the summit of Mount Washington, a stone monument remembers a life lost to one of the mountain's infamous storms.

An early 20th-century jail not far from the infamous Tombstone, Arizona.