The mansion home of author Edith Wharton.

Stay at this storybook estate, featuring Sir Henry Hudson Kitson's masterpiece "Gingerbread House."

The former residence of Elizabeth “Mumbet” Freeman, an enslaved African-American woman who successfully sued for her freedom.

The site of the first "historically true" UFO encounter in the U.S.

This former Norwegian sailor's church is slowly being taken over by ramshackle robot musicians.

Europe's oldest still-operational tea farm also boasts a spectacular view.

This abandoned five-star hotel is now a five-star urban exploration destination.

A crumbling hospital from the 1850s on Roosevelt Island.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

The second largest in the world, this massive underground void has its own subway.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

Ancient catacombs form the foundation for this Rococo orgy of a church.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A battle between nature and architecture in the Cambodian jungle.

A scenic overlook of a pit mine hundreds of meters deep filled with blue water.

Friction between grains of sand cause a curious "singing" sound.

An 80-year-old house built out of newspapers.