Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Home to the deepest rift anywhere on Earth.

No Gordon Lightfoot song, only a barebones monument to greed.

The first declared National Monument in the United States.

A fitting attraction for the corn capital of the world.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Lucha Libre (Mexican Wrestling) themed taco shop.

Giant nude woman of Tijuana is also the artist's home.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

France's most famous cemetery, with some of its most curious tombs.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A monument celebrating the idea of reaching inaccessible places.

"We Seceded Where Others Failed."

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

This replica of the Greek structure is in the heart of Nashville.

Cavernous opening completely encased in Karst limestone.

Open day and night, a church with three pews and Bibles.

Four-story concrete hotel never opened to customers.

A downtown park built on top of unclaimed graves.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.