The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

A burial vault located under Tiber Island in the middle of the Italian capital.

The mystic whose incorrupt corpse still attracts the faithful.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

A Nesting Doll of Churches.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

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

A collection of objects supposedly singed by the hands of souls in purgatory.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

The former home and studio of Belgian artist Antoine Wiertz is now a museum dedicated to his work.

Meet the bronze beloved pet to a family of famous peeing statues.

100-year-old shipwreck you can walk up to at low tide.

Forever immortalized in concrete, this Simpsons etching was crafted by show creator Matt Groening.

One of the world's tallest, oldest, and most disgusting chocolate cascades.

Private collection of art inspired by cabinets of curiosity.

This 22-acre botanical garden is home to the largest collection of rhododendrons in the world.

A nondescript Seattle restaurant inherited a piece of European history.

Seattle's super-sized cowboy apparel once belonged to a themed gas station that wrangled in herds of tourists.

Where else would a linchpin of post-colonial Native American cuisine anchor the menu but a museum?

A "sinister, whimsical, tacky, and really orange" public art installation hidden under a Seattle bridge.

The scorched Lisbon church that survived two earthquakes and a massive fire.

Get in line for Lisbon’s most famous sandwich.