This elaborate towering structure was once famed for its revolutionary height.

The first American department store, and home to the largest operating musical instrument in the world.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Pennsylvanian mass grave and possibly mass murder.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

This historic old movie house was the scene of one of the Blob's most iconic attacks.

After the attack on Pearl Harbor, rocks and fossils from every U.S. state were collected into a pyramid of national unity.

An icon among Florida's pre-Disney tourist attractions.

Former wax museum from the 1960s, home to many wax U.S. Presidents and the famous White House miniature.

Once featuring over 60 miniature replicas of famous Chinese locations, the Splendid China theme park was completely abandoned and is now mostly rubble.

A vast array of tropical plants collected by a vacationing couple.

Once a black market electronics marketplace, now an otaku shopper's paradise.

For 32 years the famous Ringling Bros circus troupe spent winters in this sunny spot in Florida.

The largest retailer of seashells in the world.

The world's largest private aircraft collection.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

This abstract sculpture is rumored to cast a hammer-and-sickle shadow once a year.

In one Chicago park, a trio of werewolves are waiting to devour their fallen brethren.

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

The collection of 80+ pieces created between the years 1100 and 1500 is intended to be seen, heard, smelled, touched, and tasted.