A mysterious, ancient collection of pre-Hispanic petroglyphs hidden deep in the Mexican desert.

Inside this mountain lies several kilometers of breathtaking caves.

One of Monterrey's oldest buildings is perched atop a hill boasting impressive views of the city.

This old steel industry company town has a tradition of parking cars on the sidewalk so people can walk in the narrow streets.

Constructed from the ruins of a former glass factory, this park incorporates the old with the new.

This rock formation above the Wabash River is part of an ancient coral reef.

Home to the world's largest refracting telescope and the birthplace of modern astrophysics.

This softly rounded mansion was built without corners not to avoid evil spirits, but to make them more comfortable.

Its eclectic exhibits range from the world’s first motorcycle to Luke Skywalker’s Land Speeder.

World's second largest particle accelerator, where nature reveals its secrets.

Urban explorers embraced America's now demolished first suburban mall, south of Chicago.

A relic of the Cold War in Chicago.

Burial mounds of prehistoric Native Americans who lived along the DuPage River.

Take a break from all the boring business of death at this funeral home mini-golf course.

First planned industrial community in the United States.

Tucked away amongst townhomes lies a restored, early 20th-century tea house and garden, the only remains of a historic estate.

A one-armed veteran of the Battle of Waterloo lies in a cemetery for one in the middle of a Chicago scrapyard.

A tribute to one granddaughter's old apartment which now represents the whims of each visitor.

The final resting place of the world's first nuclear reactor.

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

The murals have transformed a residential alley into a vibrant drive-through gallery.

A former atom smasher turned into an art gallery.

A historic beacon built in the aftermath of the worst maritime disaster on the Great Lakes.

A student designed this 3D-printed scale replica of the entire university campus.