Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

This bridge was constructed from the remains of the first Ferris wheel.

A concrete block embedded with thousands of pulled teeth was created by a local dentist to memorialize his dog.

The world's largest anatomically accurate brain sculpture.

Tucked away in the forests of Indiana resides an abandoned waterslide that is now a popular graffiti haunt.

The bespectacled, cocktail-sipping pachyderm is a strange but fitting liquor store mascot.

Covered in tens of thousands of coats of paint, this Indiana attraction holds a world record all its own.

One-layer pyramid in Indiana.

This open air cathedral invites all faiths to worship under the only roof big enough to fit them all: the sky.

A lesser-known part of the Kinsey Institute is this impressive collection of art, artifacts, and material culture related to human sexuality.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

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

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

This historic Pittsburgh tennis complex is a rare example of natural red clay courts.

This icon of the Atomic Age now lays dormant.

Built in the 1970s, this curious modular home found new life as a sundae-shaped ice cream stand.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

Featuring the largest CinemaScope screen in Pennsylvania, this drive-in has entertained moviegoers for more than half a century.

A miniature golf course crafted inside the world's largest simulated cave.

Nothing says indulgence like a 1,500-pound chocolate castle.