A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

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

The atmospheric road was never meant to be so creepy.

A 30-acre garden inspired by the principles of modern physics.

The world's largest collection of witchcraft regalia.

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

The sign at the garden gate reads: "These Plants Can Kill."

These fantastically named natural pools look like something out of a Scottish myth.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A fiery crater has been burning in the Karakum Desert since 1971.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

Ship-sized kinetic sculptural fantasy.

This luxury shopping lane has been protected by its own tiny police force for over a century.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

This elaborate Byzantine-style building was designed for a not-so-pretty purpose.

A famous burial ground with a history both grim and literary.

This artist's home turned gallery/museum preserves the creator's love of "Eastern" influences.

London's largest outsider art museum.

This home on a quiet suburban street is completely covered with vibrant mosaics.

A mysterious crater-like pond has a spooky tendency to empty and fill with complete disregard to rainfall patterns.