This sprawling, Brutalist estate feels like a city within a city.

This tile-work piece featuring a chicken riding in carriage is both a remarkable artistic creation and a social commentary of politics and culture in 17th-century Portugal.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

The world's oldest bookshop still in operation.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

An inverted staircase above the entrance to the Bethnal Green Underground Station functions as a memorial for people who lost their lives during the worst civilian disaster in the U.K. during World War II.

Visit on a Sunday morning to see some killer tricks.

These 19th-century gas tanks were remade into an apartment complex.

The niches over the western entrance of Westminster Abbey honor individuals from the 20th century who gave their lives for their Christian beliefs.

The spot where three Protestant clergymen were burned at the stake during the reign of "Bloody Mary."

Hidden in plain sight, this creepy sculpture watches from above.

The lantern carried by the infamous Guy Fawkes when he was arrested while attempting to blow the houses of Parliament and the King of England to smithereens

Used as an example in one of the first dictionary entries for "museum" in 1706.

An extraordinary collection of scientific instruments - and Einstein's chalkboard - inside the world's oldest purpose built museum building.

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

This is London's smallest listed building.

This charming, narrow-gauge railway in the Thames Estuary is sometimes referred to as the "Train to Nowhere."

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Colorful murals by Jean Cocteau hide within this peaceful London sanctuary.

This lush area was the site of extensive enemy bombing during WWII.

Preserved behind glass, the ruins of a medieval building used to store human remains.

The next-door homes of two very different musicians, George Frideric Handel and Jimi Hendrix.

Outside of one of Britain's most renowned social clubs, a step installed specifically for the Duke.