A collaboration of art and ornithology mourns the calls of Sydney's lost birds.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

An off-the-beaten-path boutique stuffed with an eclectic collection of upcycled goods.

A unique spiral staircase that doesn't quite make it up to the top floor.

A railroad magnate's replica village has become home to a genetic seed bank for rare breeds of livestock.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

To avoid the demolition costs this abandoned drawbridge was simply left in the up position.

An architectural statement of artistic intent smack in the middle of Providence, Rhode Island's Colonial uniformity.

This 3,500 pound obelisk was constructed with more than 1,000 reclaimed guns.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

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

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

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

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

A snapshot of the city's fascinating voodoo culture.

A psychedelic labyrinth on the San Francisco bay.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

A mysterious artist-run cabinet of curiosities and library.

Narrowest house in Boston.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

A hidden gem full of oddities, curiosities and macabre antiques.

A "Minnesota-style" pizza parlor in the Scandinavian heart of Seattle.

One of the oldest continually operating drinking establishments west of the Mississippi.

The anatomical-pathological collection of a man who changed surgery.