Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

Berlin's old airport.

This innocent-looking townhome is actually a subway exit.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

The factory for the popular Dumbo location, the Greenpoint shop is a quiet gem.

Western Europe's only representation of a Roman goddess still in its original location sits in an unassuming park.

The highest point in Washington state is a volcano covered in glaciers.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

Three prestigious academic collections come together to create a world-class natural history museum.

Plot your trip through the city on the sidewalk.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

The unbelievably opulent home built for an infamous newspaperman.

This former coal gasification plant found a curious second life as a popular public park.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

A fascinating insight into daily life in the Eastern Bloc.