The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

Christ's blood allegedly preserved in a Belgian town.

The only international border marker within the United States.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

The only arched bridge made of stone on the entire Mississippi River.

When flour explodes, it's not a pretty sight.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

Geometry and mystery come together in an epic show of octagonal masonry.

Southern Italy's spinning top village.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

Erotic art covers the walls of the largest ancient pleasure palace.

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

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Ancient snack bar of the Roman Empire re-opened.

Five candy-colored villages on the Italian Riviera.

Pilgrimage site for star-crossed lovers.

Go inside to really appreciate this 500-year-old technological masterpiece.

2300-year-old Roman road connecting the empire.

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