This historic patch of real estate offers a glimpse of colonial Boston.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

On the Oregon coast there is a natural hole that seems to be draining the sea.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

An enormous, inside-out glass globe built in 1935.

An exquisite tunnel of cascading flowers.

On Japan's Tashirojima Island, cats are king.

A crumbling hospital from the 1850s on Roosevelt Island.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A psychedelic labyrinth on the San Francisco bay.

A layered tribute to the work of mosaicist Isaiah Zagar.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

World's first "penitentiary," meant to be humane, drove men insane.