This 500-meter-long memorial pays tribute to the hundreds of thousands of lives lost to COVID-19 in the UK.

This ancient spring in central London was featured in a Peter Pan story.

Art under your feet honors the history of a working-class London neighborhood.

A forgotten underground railway once whooshed trams beneath London.

The (fictional) address of Sweeney Todd's bloody barbershop.

Where the dead once lay, art now plays.

The ground on which Shakespeare’s initial playhouse once stood.

The world’s second-largest flood defense barrier has protected London for decades.

This is the place where U2’s lead singer got his nickname.

A guitar mounted on a wall in Temple Bar honors the Irish musician.

This 18th-century fort surrounded by a moat was used to store gun powder and ammunition, and now sits in the middle of a large park in Dublin.

A mysterious, abandoned Chinese building in Mexico pays homage to the area's East Asian immigrants.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

One of the largest caves in the world open to the public.

This Roman monument is surrounded by more recent construction, offering a stark contrast between ancient architecture and the modern urban landscape.

One of the tallest lighthouses in the world also serves as a monument to the fallen of World War I.

During World War II, this rice mill became a Nazi concentration camp.

A freedman baker’s lavish tomb has a relief showing various stages of Roman bread making.

This unassuming bridge is most likely one of Michelangelo's unfinished masterworks.

When this 400-year-old fountain fell into disrepair, officials covered the mess up with what looks like a giant soup tureen.

A square-domed symbol of resilience in the heart of the old Jewish Ghetto.

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.