The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

One of Ireland's most infamous prisons for rebels including men, women and children.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Two stunning 17th-century libraries and a cabinet of curiosities.

Macabre astrological automaton clock dating to the late 1400s.

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

2300-year-old Roman road connecting the empire.

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

The only museum with its curator—and her pets—buried inside.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Cabaret where the show girls are all androids, and the patrons couldn't be more pleased.

This 14th-century temple is also known as the "Temple of the Golden Pavilion" for its gorgeous gilded reliquary hall.

Colloquially known as “piss alley,” this narrow street filled with tiny bars and barbecue stands looks like it was pulled straight out of “Blade Runner.”

The 10,000 Torii shrine.

This 700-year-old street food market features baby octopus and soy donuts.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

Paris' fabled purveyor of exotic taxidermy and natural history curios.