This old KLM airplane cut into three parts was transformed into an eclectic airport gift shop.

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

This public toilet built in the famous Amsterdam School architectural style is a Dutch national monument.

Once the world's biggest telescope, it was later used as a coat hanger by a famous Dutch astronomer.

For over 100 years the most important physicists in the world have autographed this university wall.

An unassuming rod in the Netherlands was once the old standard unit of length for the entire Dutch empire.

One of the Leiden's oldest pubs is also the birthplace of the Heineken star.

A lecture hall sink once used by Einstein and other noted physicists is now regarded as a strange science relic.

Amsterdam's former hotspot for public executions and dissections.

A haunting painting meant to capture the calamity of World War I.

This unassuming building produced some of the world's most famous bells.

The bronze uniforms commemorate the vital role of women during World War II.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

England's most famous front door has an accidental doppelganger.

A building that survived WWII, possibly on the virtue of its name alone.

The plunge pool is a surviving relic of a rowdy royal residence.

The commemorative stone column conceals a secret laboratory.

The pretty iron lamp is a reminder of the architecture underneath London's streets.

A relic of Victorian grandeur hides beneath a busy South London road.

The secret wartime bunker built on the platforms of an abandoned Tube station.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

Eighty million natural history specimens call this gargantuan museum home.