The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

An impressive collection is dedicated to the legendary beast.

A man's home is his castle.

A curious whirlpool formation supposedly capable of entangling or engulfing branches, tree trunks, or whole rafts full of hapless tourists.

One of the world's largest automobile junkyards is a unique landscape of metal and moss.

This intricate Hindu temple is the largest of its kind outside of India itself and was constructed like a giant puzzle.

Bad farming practices caused this unnatural natural wonder.

This botanical garden outside Chicago boasts an array of more than 300 varieties of lilacs.

Kentucky's longest operating jail is now a spooky spot to spend the night.

The longest navigable underground river in the United States is home to countless blind and albino animals.

This mysterious hill seems to pull objects uphill.

A chapel built by Italian POWs during World War II tells a forgotten tale of the war on the home front.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

Unique tower has outlasted a takeover of the company.

This unassuming home was once “grand central station” for the Underground Railroad.

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

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

This small museum is kept in a house that was integral to the genesis of Uncle Tom's Cabin.

For over 100 years, this Indiana town has had a tree growing out the top of the local courthouse.

The largest ancient burial mound in Ohio.

This bridge uses an inverted bowstring truss and is believed to be the only of its kind in the United States.

More than 3,200 cookie jars line the walls and shelves of this little shop and over 1,000 salt and pepper shakers

A theme park featuring a replica of Noah's Ark built to the measurements specified in the Bible.

A castle built by an eccentric medieval enthusiast in rural Ohio.