Romania's triumphal arch looks out over Bucharest.

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

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

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

This Renaissance palace features a unique architectural design and is now home to the Ferrara National Art Gallery.

The steel cable lets adventurers zoom between two mountain towns at speeds of up to 75 miles per hour.

One of the earliest depictions of an Arthurian scene that is shrouded in mystery.

This beautiful 150-year-old synagogue survived Italy's fascist period and the Second World War.

Once the hunting reserve of a noble family, this is one of the few remnants of Pleistocene planitial forest in northern Italy that still stands.

The "floating factory" was a highlight in the career of the Italian architect known for his unusual use of reinforced concrete.

A small villa said to have inspired the design of the court jester at the heart of Giuseppe Verdi's 1851 opera.

An architectural oddity where the triglyphs of the courtyard of walls create an optical illusion.

A room filled with frescos that make it seem like the walls are crumbling down while giants die in despair.

Renaissance villa and gardens complete with a tormented colossus.

The oldest church in Mantua was buried for centuries under the facades of other structures.

A luxury hotel housed in a former 15th century Gothic church.

The only Shinto shrine in Europe that has been officially sanctioned by Japan.

London's smallest police station is barely the size of a phone booth.

A mysterious shape catches the eye in this 16th-century painting.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Medieval streets buried beneath a papal fortress now form an underground city you can walk through.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

Stumbling upon this whimsical wooded garden is like stepping into an enchanted forest full of philosophical musings.

A stunning medieval castle houses this eclectic, interactive tribute to all things wine.