The tragic heiress Barbara Woolworth Hutton built her seventh husband this Japanese-inspired palace in Mexico.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

Unrepaired walls from a 1920 anarchist bomb attack.

A no-frills cinephile haven known for showing offbeat, underseen films.

The Underground Railroad passed right through this historic Brooklyn Heights church.

This innocent-looking townhome is actually a subway exit.

Ride the subways of yesteryear.

This block in downtown Brooklyn was a hotbed of antislavery activism along the Underground Railroad.

Volunteer-run library dedicated to exploring five decades of activism history.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Perhaps the most unique of any Frank Gehry design for one simple reason: Gehry himself actually lives here.

Giant origami crease patterns engraved in Santa Monica intersections may even be visible from space.

A surprisingly beautiful abandoned World War II military base in East Greenland.

The world's northernmost flowers cling tenuously to life on desolate Kaffeklubben Island.

A Cold War atomic camp buried under the ice is now emerging because of global warming.

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

Michael Heizer's masterwork in the Nevada Basin.

A sculpture for the sun and stars, created by Nancy Holt.

Despite his legacy of work in Spain, Cuba, and Florida, the larger-than-life writer's grave is a simple affair tucked in an Idaho cemetery.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

This women-run eatery and cooking school is putting India's long-neglected tribal cuisines back on the menu.