At almost 1,000 years old, this is the oldest known door in all of Britain.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Eighty million natural history specimens call this gargantuan museum home.

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

A gallery specifically dedicated to the botanical illustrations of a remarkable traveling lady.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

This once-derelict building is now one of the most beautiful bookstores in the world.

One of the most controversial statues in Romania is an emperor with no clothes.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

Romania's triumphal arch looks out over Bucharest.

The kitsch mansion of the former Romanian president Nicolae Ceaușescu features a golden bathroom.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

A window into a long-lost world, these colorful tiles advertise a long-defunct range of purgative teas, harmless smokables, and diarrhea cures.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Commonly acknowledged as the only public monument to the Devil himself.

A lush indoor jungle fills this bustling Madrid transportation hub.

Just like in Hollywood, Madrid has also a forgotten walk of fame.