Fortifications built for a Soviet invasion that never came now sit abandoned in a losing battle against nature.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

Rare recess caves fill this unbelievably beautiful Ohio park.

Two creeks flow out of either end of this canyon in opposite directions.

Twisted girders are all that remain of an Icelandic bridge that was wiped out by a combination of volcanic heat and glacial floods.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

The loneliest island in New York.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

The most unloved grain elevator in Brooklyn was a “Magnificent Mistake.”

The oldest surviving synagogue in New York City is now a soaring art space.

Detailed facade of a brownstone in Boerum Hill.

Nondescript elevator doors open to reveal a stunning, surreal world.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

A hip bar decorated with walls of golden skulls.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

This otherworldly church spire reaches up toward the heavens.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

This ornate church designed by a self-taught architect is an eclectic masterpiece in the heart of Central Mexico.

The artwork detailing the city's history features a few controversial characters.