From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

Yup, that's a 330-foot yacht passing over the highway.

Amsterdam's former hotspot for public executions and dissections.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

The unusual sculptures are believed to be powerful political symbols.

Legend has it fairies gathered at the site of this medieval castle.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

This demon atop the Notre-Dame de Paris looks utterly bored.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

Ruins of a German castle on top of a towering stone pillar.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Belly up to the bar in Cowtown, don't forget to buy some boots.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

Now a museum, this building was once a 14th-century monastery and the place where the founder of the Dutch nation lived and was assassinated.

The 20-mile causeway that separates the Netherlands from the sea.

This giant wire frame man sculpture is crouched in contemplation.

The place where Czar Peter I of Russia resided in 1697 during his Grand Embassy.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

A miniature city, once ruled by the Queen of the Netherlands.

Go inside a revolutionary, cage-less zoo where 35 species live and some of them roam free alongside their human visitors.

This local emblem is the oldest and largest dragon tree in the Canary Islands.