The personal charnel house of Anton Bruckner.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

A failed, un-built suburb that has been going feral for decades.

One of many gator theme parks, abandoned in the sugar fields of South Florida.

A church of bones, decorated with 40,000 human skeletons.

Mysterious painted skulls in Moravia.

Europe's second largest ossuary wasn't discovered until 2001.

This museum gives tribute to the underappreciated "Down-South Submarine."

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

Ruins of a Carnegie family mansion on Cumberland Island.

A tribute to Ponce de Leon's supposed quest for eternal youth.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

Location of a reliquary containing bone fragments of 18 saints.

A house of bones — but nobody is quite sure to whom they belong.

Grotto replete with mystical designs laid out in glued shell mosaics.

"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

The beauty of urban decay, hiding some dark secrets.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

Amazing pre-Civil War ruins alongside a shallow, rocky river that hosts beautiful (but endangered) lilies.

A museum dedicated to exhibiting remarkable outsider art.

A natural tidal swimming pool is ringed by bizarrely artistic lava rock formations.

A palatial sculpture park was built illegally and in secret by a self-taught artist over 36 years.

Started as a kitchen garden, now the second largest botanical garden in the world.