A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

Built by crowdsourcing, this wooden foot bridge saved a part of Rotterdam that was languishing in wait of city funding.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

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.

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.

This Scottish graveyard is the final resting place of the man who inspired the character Ebenezer Scrooge.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

Protecting the dead from opportunistic body snatchers.

The tomb of one of Scotland's bloody historic villains is a magnet for bumbling desecrators.

The most loyal of little dogs, or a Victorian era publicity stunt?

360° views of the city plus five floors of optical illusions and hands-on science.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

Possibly the world's smallest museum is home to one exhibit that sheds light on the capital city's dark criminal history.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

Now home to a drinking establishment, this building has a macabre history.

This historic timepiece was a popular meeting place for romantic rendezvous in the 1960s.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

Cold war icon and onetime "hole" in the iron curtain.

This enormous steel tube is the biggest speaking horn in the world.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."