This wooded grove of beautiful hand-built stone grottos is a hidden gem within a shuttered Franciscan monastery.

The first rural cemetery west of the Mississippi is home to the elaborate tombs of St. Louis' local beer barons.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

An abandoned concrete jungle surrounded by a lush park.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

This massive marble memorial was built bit by bit either out of devotion or spite, but at the expense of the surrounding town.

The world’s largest combined collection of U.S. and Russian aircraft got its start in a poultry building.

A unique attraction and museum dedicated to exploring iconic roadside structures.

An acoustic anomaly with a mysterious cause.

This small hut in the middle of a parking lot was once the wooded sanctuary of the 'Hermit of Montrose.'

A unique book shop with a collection of rare tomes and a nostalgia museum.

Alabama has a fiberglass Stonehenge. With apologies to Spinal Tap, this one is full-size.

A miniature city built by a single hunchbacked monk.

Famous for its bio-luminescent inhabitants, known as "Dismalites" .

Piled high inside this warehouse and coffee shop are salvaged goods that span every corner of the globe.

Eight feet in diameter and more than 24 feet around.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

This ostentatious Italianate palace of an Oklahoma billionaire is filled with several themed mini-museums.

The collection is housed in an exquisite mansion that makes you feel like you've been transported to an Italian villa.

The granite monument is engraved with the image of the talking horse's head coming through a barn door.

Unique tower has outlasted a takeover of the company.

A museum that houses the world's largest collection of ventriloquism dummies.

The famous greeting card maker owns a collection of paintings by the famed surrealist.

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