The cutest way to stay safe in traffic.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.

A line number in Amsterdam that will likely never be used again due to its tragic history.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Scale model of St. Peter's Cathedral (Rome) in the middle of a small Dutch town.

This post-Ottoman era church in Athens was built by locals to serve the residents of Anafiotica

This church was constructed on the site where St. Philip the Apostle preached to the ancient Athenians.

Go inside a revolutionary, cage-less zoo where 70 species of monkeys roam free alongside their human visitors.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

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.

Wind power station for making famous Ketel One vodka.

Home to the world's oldest functioning orrery.

The heart of Dutch football history.

For the holidays, the tallest broadcasting tower in the Netherlands turns into one of the world's tallest Christmas trees.

A rare double mill nestled along the banks of the Aa river.

Portraits of musicians line Oude Binnenweg, the jazziest street in the city.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

The mirrored section takes the shape of Hebrew characters when viewed from above.

The attic of a four-century-old canal house hides a clandestine church.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

This ancient structure is widely thought to be the oldest intact pyramid in the world.