These wooden pipes were crucial to providing water to Medieval Edinburgh.

A plaque is all that remains of a lost Oxford transport hub.

A hidden plaque is the only reminder of the lost palace where two storied English kings were born.

The location of a citizen uprising that led to a gruesome act of mob justice.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

Reminders of the Battle of Berlin still scar the railway.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

From Iggy Pop to David Bowie to Nick Cave, this regal music studio has served some of the all time greats.

A monument to the man who almost killed Hitler.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A special train service transported Sydney's dead from this station to "Necropolis Receiving Houses" at Rookwood Cemetery.

A self-funded cemetery with a long list of inhabitants.

Though considered an eyesore by some, this boxy Brutalist high-rise plays a significant role in Sydney's past.

A monument to the 4,114 Irish orphan girls who arrived in Australia between 1848 and 1850.

A replica of the Liberty Bell rang daily from West Berlin's City Hall throughout the Cold War.

A towering monument to war, located on a beautifully peaceful hill.

A traditional U-Bahn station in Berlin gets a string of rather untraditional benches.

The 1852 novel "Uncle Tom's Cabin" lends its name to a subway station, a street, and several shops on the edge of Berlin.

This conical hill was built as a testing ground for an engineer known as the Glider King.

This museum is home to a sugar sculpture of the Berlin Airlift Memorial.