This pedestrian walkway cuts through a cemetery and over several burial vaults.

Recently restored menagerie of Victorian-era beasts.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

A refugee returns to his homeland to open Ho Chi Minh City’s first Michelin-starred restaurant.

Meant to be a lavish presidential home, the palace became a symbol of the fall of South Vietnam.

Witnesses claim the Virgin Mary statue outside the church once mysteriously shed a single tear.

This French colonial post office is arguably the grandest in all of Southeast Asia.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

The first regular high-definition TV transmissions were made from this seemingly out-of-place mast located on one corner of a Victorian-era entertainment venue.

London’s first road overpass is so old that it was originally built for horse-drawn carriages.

One of London's lost rivers runs through a pipe over the tracks of this subway station.

The Great Fire of London and the regulation of one-way streets both started in this alley.

The medieval woodcut-style artwork chronicles life in medieval London.

Though it's not the largest, this one-kilometer outdoor market is reportedly the longest in Europe.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

An architectural oddity hides in plain sight on this iconic London bridge.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

Pop culture has helped to keep this iconic British building from being destroyed.

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

Scattered throughout London are ancient remnants of the city's former bounding wall.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

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

Eighty million natural history specimens call this gargantuan museum home.