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

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

One of the earliest depictions of an Arthurian scene that is shrouded in mystery.

Where Venice's gondolas go for a tune-up.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Italy's curious field of mud volcanoes is named for being both gross AND salty.

The oldest stone house in Paris was built by its most famous alchemist.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

Christ's blood allegedly preserved in a Belgian town.

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.

Only a fragment of this 15th-century Dance of Death survives today.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

Super-heavy Nazi architectural experiment.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

The Columbia Road Flower Market is now open every Sunday, rain or shine.