A former zoo turned public park, where visitors can hang out in the old animal cages.

This Parisian café sticks almost exclusively to an ethos of reuse.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

This high-design church is made up of two dizzying spirals meant to evoke the weaving together of marriage.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

Because sometimes you need to make a batch of frites even when the stores are all closed.

This repurposed church offers a more literal way to get closer to the heavens.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

An unassuming secret door once led to a legendary watering hole.

A lavish 16th-century mansion filled with spectacular staircases, fantastic frescoes, and gorgeous gardens.

This abandoned subway station can still be seen on regular commuter trips.

An otherworldly restaurant perched on the edge of a jagged cliff next to a medieval holy city.

An abandoned suspension bridge on the Falkland Islands is crumbling into the water.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

The abandoned ruins of a failed resort hide on this verdant, picture-perfect island.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

A desert settlement founded and later abandoned by Hawaiian members of the Church of Jesus Christ of Latter-day Saints in Utah's Skull Valley.

Shipwrecks, ruins, and turtles are all that remain on this haunting Caribbean ghost island.

This tiny patch of arid sand sits in one of the greenest states in the United States.

A creepy, deserted mock Arabian village can be found in the middle of the Qatari desert.

A miniature desert appears out of nowhere on the lush isle of Lemnos, like something out of a Greek myth.