One of the Cemestos prefab homes built to secretly house thousands of Manhattan Project workers.

The secret city built by the Manhattan Project.

A failed utopian experiment for British expats in the American South is now a Victorian village frozen in time.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

A 19th-century architectural wonder designed by the "father of the skyscraper."

The seat of Buffalo government is a gorgeous Art Deco palace.

This unique crypt designed by Frank Lloyd Wright for his longtime friend was not completed in either man's lifetime.

The absurd creation is a compulsory destination for selfies in Buffalo.

Rochester's signature culinary delicacy.

Canada's oldest railway tunnel is illuminated in a rainbow of color as it passes under the streets of this small city.

A castle built for love, and abandoned due to heartbreak.

This tiny little island has, as the name says, just enough room for its single house.

Where monkeys run wild and the humans are caged.

A mysterious castle built as a monument to lost love.

One of the world's largest automobile junkyards is a unique landscape of metal and moss.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

Visit this playground of waterfalls, caves and sinkholes.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

Follow the steps, and this roadside artwork will teach you how to dance.

This historic train station has been converted to a locomotive themed hotel.

This museum dedicated to an oft-overlooked support industry features a surprisingly moving brass diorama of a man being saved from a sinking car.

A bizarre roadside attraction and the first instance of miniature golf in the world.

A CT scan revealed the identity of this 3,000-year-old mummy that everyone erroneously thought was female.