The final resting place of the poets Shelley and Keats.

2300-year-old Roman road connecting the empire.

Virgil's many-mouthed gateway to the underworld.

A submerged archeological park still holds the wonders of a Roman Sodom.

Pompeii's less famous neighbor is still revealing her secrets.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

Architectural monsters are devouring this palace's every door and window.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

An alchemist's "magic door" stands in the middle of a Roman park.

An Australian lake whose pink hue defies scientific explanation.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

A swing to dangle you off the very edge.

The oldest hotel in the world has been operated by the same family for over 1,300 years, even catering to samurai.

An artsy hidden staircase leads to breathtaking views of San Francisco.

The world's only complete colossal squid specimen is on display at the Te Papa Museum.

This massive blockhead sculpture hides an entire library.

This botanical garden outside Chicago boasts an array of more than 300 varieties of lilacs.

Some North Carolina Cherokee have been keeping their history alive for decades with a single play.