A plaque at the lighthouse where Frederick Valentich made his last radio contact before he vanished without a trace.

These 1,500-year-old remains were found in a mysterious Anglo-Saxon mass grave.

Baroque celebration of the end of the Great Plague of Vienna.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

The Habsburgs' royal collections of art and wonders.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

A two-way chairlift system between Zugliget and the highest point in the city.

A Hungarian optometrist's charming collection of Asian art and curiosities.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

This quiet, unassuming spot in Budapest was the birthplace of the bloody 1956 Hungarian Revolution.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

The walls of the iconic dome are hollow and have a secret stairway.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

This historic pub has maintained much of its 1906 decor, including a small sequestered room for women, where orders were slipped through a tiny window.

The beloved bard's garb is proudly displayed within a Freemason's hall.

Small museum dedicated to the founder of electromagnetic theory.

Built to hold the worst of the worst of the Nazi war prisoners.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.