Ruins of a German Castle on top of a towering stone pillar.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

Sloth rehabilitation center in the jungle of Costa Rica.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

An unusual round church in London with a Templar past.

An emerald-green grotto just a short trip from Austin.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

Dioramas and animatronics lead you through the story of Bhagavad-gita, the Indian literary classic.

The last of its kind in the country.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

Resting place of Hollywood's immortals is also site of summer film screenings.

A library of rare occult books in Los Angeles.

Small museum packed with artifacts recovered by the man rumored to be the real-life inspiration for Indiana Jones.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.