A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

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

Macabre astrological automaton clock dating to the late 1400s.

This abandoned lock-up was saved because of its connection to a local football team.

This aging storage facility is the world's largest brick warehouse.

Gutted during the Liverpool Blitz, this architectural husk has been left destroyed in honor of the dead.

The Liverpool street made famous by the Beatles is real.

This former lifeboat house now used by a funeral service was the site of a 19th-century boating tragedy.

The second-longest pier in the U.K. stretches a whole kilometer into the Irish Sea.

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

One of the largest underground systems runs under Canada's largest urban center.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

This historic Canadian jail was once the longest operating prison in the country and is now open for people to incarcerate themselves.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

Brussels' favorite peeing boy has a sister.

A little sculpture with a large wardrobe.

Cozy basement bar sports an inventory of over 2,000 beers.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

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.