An abandoned 1970s theme park that has been turned into a space for waterfront walking.

The Incredible Hulk, Yoda, Mulder and Scully, and many many others watch over the mean streets of Toronto.

This urban oasis is a marvelous meld of music and landscape architecture.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

An outlet for connecting to memories of lost loved ones and saying goodbyes you never got to say.

An 18th-century Catholic church converted into an eccentric temple of music and bacchanalia.

Hundreds of protractors affixed to surfaces all over the city.

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

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A computer bug so primitive it was an actual insect.

Fears of Satanic worshippers swirl around five Celtic-inspired megaliths.

A local scoured more than 1,000 acres for stone to create his masterpiece.

An abandoned theme park with a strange and tumultuous past.

A former 19th-century tavern, famous for its peach brandy and honey concoction.

This natural sandstone bridge hasn't been seen since the 1960s when Lake Powell covered it—until now.

There are no bodies inside these stone coffins. And there never were.

Stay in a room with a view... of the bottom of the ocean.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

The underground sanctuary of a mysterious ancient cult.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Gladiators once walked this ancient, subterranean passage.