The purported world's shortest international bridge connects a homeowner in Canada to his backyard in New York.

The building features one of the last remaining free-floating spiral grand staircases in the U.S.

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

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

The final resting place of Gary Gygax; co-creator of Dungeons and Dragons.

These modest Midwestern formations are kin to Niagara Falls' impressive cliffs, more than 600 miles away.

This rooftop sign has been confusing Milwaukee-bound airline passengers for decades.

The site of an ancient Mississippian settlement that appears to have flourished during the 10th to 13th centuries.

Walk up a ramp through a forest for panoramic views of Lake Michigan.

A bronze plaque marks the site of the only show the "King of the Soul Singers" ever missed.

Every winter, dozens of otherworldly ice structures sprout up from a rigged up artesian well.

A tribute to the twin ideals of religion and patriotism, built by a Catholic priest from rocks, glass, and innumerable found items.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

One of Frank Lloyd Wright's final works was this UFO church.

This punny mirror of another Wisconsin attraction is exactly what it sounds like.

Once a speakeasy operated by Al Capone, this Milwaukee cigar bar is now a haven for ghost hunters.

This striking art museum holds an amazing series of curiosity cabinets.

This small piece of Michigan is entirely surrounded by Ohio.

The famed architect designed this Minnesota gas station of the future with a lookout tower.

This grave in a ghost town cemetery marks the death of a witch on a day that never happened.

What do we know about the real woman behind one of the Beatles' most famous songs?

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

The location where the iconic movie character declared it was time to go home.