Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.

Stone shrouds of Prince Liu Sheng and Princess Dou Wan of the Han Dynasty, created to preserve their flesh for eternity.

The humble gravesite of the man who failed to cash in on his Pepsi-cola goldmine.

The world's largest collection of witchcraft regalia.

Home on the Hillside, and home of the first breakfast cereal.

An abandoned castle owned and ignored by Masons carries a cursed history.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

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

This cemetery served as the only official burial grounds in Cambridge for nearly 200 years.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

This little-known relic crypt holds stolen parts of a Roman Empress.

The encased skull that is widely believed to belong to St. John the Baptist.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

One part local history, 99 parts gruesome haunted house.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

The site of a tragic massacre that spawned a multimedia franchise.

This abandoned amusement park was built on a site with a dark history.

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

A museum designed by and dedicated to P.T. Barnum in the town where he is buried.