A hidden treasure of an abandoned city lies deep in the jungles of Campeche, Mexico.

A 500-year-old series of tunnels long believed to be folkloric was uncovered beneath the streets of Puebla.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

This restored house is like a time capsule of the president's unconventional inauguration.

This former hub for crafty philosophers was founded by a writer who died aboard the infamous RMS Lusitania.

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

Museum dedicated to the struggles of the disabled.

Ruins of a once-prized railroad station in New York.

A beautifully designed asylum was resurrected as a hotel and art center with a ghost story or two.

Weighing 30,000 pounds, this monument represents Detroit's first industrial era.

A physical reminder of Earth's ancient past, this rock results from the photosynthetic processes of some of the oldest forms of life.

This solemn facility remembers the cruel effort to compel Native American children to relinquish their culture.

Everyone's invited to put on a miniature concert with this world-class musical wonder.

These gardens recreate unique and endangered Michigan habitats.

It leads to a former hospital’s old root cellar.

Where most of the world's flypaper was made.

Detroit’s Eastern Market has been transformed into an outdoor museum with colorful murals that address social issues and symbolize the city.

The origin of the Nixon tapes is rooted in technological incompetence as much as secrecy.

The park is home to the United States's only still-operating Dutch windmill.

The former home is said to be haunted by the ghosts of the beloved mayor and his wife who lived here.

Largest magic museum in the United States with more than half a million pieces of memorabilia.

This sprawling bookstore spans four floors and has more than a million books in stock.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

This former industrial site has transformed into a community sculpture garden that hosts monthly Full Moon parties.