A pre-war mansion that survived the modernization of Athens.

An ancient site that has revealed incredible artifacts including portions of the Themistoclean Wall.

A former military hospital is now used to study and preserve artifacts of the Acropolis.

This Ottoman-era church is hidden amid a busy tourist area.

An ancient Greek monument and a Byzantine church coexist inside this cave.

An often overlooked ancient site in downtown Athens with substantial history (and nature).

These ancient Roman burial mounds have stood the test of time.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

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

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

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

This unassuming building produced some of the world's most famous bells.

An eccentric Victorian aristocrat's enormous collection of medieval armor and weapons from around the world.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

A bronze bust commemorates the heroism of the secret agents who led covert operations against the Nazis.

This ancient Egyptian obelisk still bears the wounds of World War I.

This East End pub gained notoriety as the site where gangster Ronnie Kray publicly shot a rival.

According to legend, this tomb holds the secrets to time travel.

A 1950s beatnik coffee house, turned 60s counterculture hotspot, turned modern music venue.

This historic building displays the remains of a victim of the devastating 14th-century plague.

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

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

The television series' iconic giant foot was borrowed from this classical painting.