One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

Hear the quietest sound from across the dome.

A sculpture outside London's oldest cathedral honors the Mohegan chief who died while petitioning the king.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

This 1920s Dutch barge is now a floating bookstore.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

Catacombs turned marketplace.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

A kaleidoscopic warehouse-maze of handmade neon signs.

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

The main gates have been locked since 1745 and will remain so until the Stuart Dynasty returns to the throne.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This secret gem of a toy store houses a rideable carousel populated with fantasy animals.

An architecturally-focused antique shop.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

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

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Storms, funding, and in-fighting have kept this Bermuda church from ever being completed.

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

Natural cathedral designed by Italian artist Giuliano Mauri.