Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

17th century palace once a meeting place for politicians.

Romania's triumphal arch looks out over Bucharest.

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

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

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

A striking symbol of the Bulgarian capital.

An interactive museum-like experience takes visitors back to 1980s Communist Bulgaria.

Sofia's legislative center is continuously reinventing itself.

Breathtaking and huge 430 year old maps of Italy.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

The original home of the Caesar Salad.

The world’s oldest active sailing ship.

The classic Atari game's iconic aliens have invaded downtown San Diego.

The miraculous hydrant that saved the Mission District in 1906.

A magnificent collection of imperial armor and weaponry.

This strange statue features a bust of the famous composer plopped atop a woman's body.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

The world's largest frame offers spectacular views of the city's past and present.

Qatar's oldest market can trace its origins back more than a century.

This abandoned fort is said to be the most haunted place in India, so much so that entry is prohibited after sunset.

An ancient wall in the shadows of the Amber Castle.

This opulent 16th-century Maharaja’s palace is a unique mix of Hindu and Muslim designs.

Sacred Indian temple that’s all monkey business.