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

Another entry into the world of Edinburgh's pop-up artworks.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

This ordinary street was made infamous by a legendary visit from the devil.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

Museum on earth sciences featuring a recreation of a famous curiosity cabinet.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Hans Christian Andersen for the postmodern world.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

This sublime architectural marvel is a rare example of an expressionist church.

During the holidays, a vintage subway train whisks New Yorkers back in time.

The "Seinfeld" diner.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

A legendary speakeasy bookstore returns from the brink.

The largest of London's subterranean rivers and once a mad, bad center of London life.

A tongue-in-cheek arcade where the games are based on everyday life.

The curios of pharmacist and collector Henry Wellcome.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.