The remains of a chapel created for convenience.

Once the most painted on object in the world, this short campus fence is well on its way to being so again.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

A burial ground of rusting metal grave markers.

Giant topiary dog once played a role in a terrorist bomb plot.

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

Diego Rivera's massive tiled fountain and failed infrastructure project.

Frida Kahlo's childhood home, now a museum of her life and works.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Bowl in splendor, if you're lucky.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Steam out your ears for New Year's Eve.

Haven for steampunks.

Sniff the Titan Arum's rotting flesh.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

World War II bunker still standing on the New Jersey beach.

World's first "penitentiary," meant to be humane, drove men insane.

A layered tribute to the work of mosaicist Isaiah Zagar.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.