Where condemned pirates met their grisly end at the gallows on the River Thames.

The London pub overlooks where the Mayflower was moored before setting sail for the New World.

The arching stretch of London's longest street holds many reminders of the area's maritime past.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Black cat statues guard this temple-like Egyptian revival factory.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

Catacombs turned marketplace.

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

Home to Alan Turing, the cracking of the Enigma code, and Captain Ridley's shooting party.

A measuring mishap led to these artificial stone ladies losing their stomachs.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

This sculpture encompasses the emotion of rail travel.

This Alaskan town appoints the general store's resident feline as honorary mayor.

Once America's tallest structure, now a Baltimore landmark.

Wedged between two sets of row houses is an awkwardly located family graveyard.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

The site where Poe “in great distress, and ... in need of immediate assistance” likely died.

Once a thriving business district, this former shopping area is now an urban ghost town in the heart of the city.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

The trials and tribulations of marking Poe’s grave.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.