Go inside to really appreciate this 500-year-old technological masterpiece.

Two stone columns flank the grand Venice square, but there were supposed to be three.

This medieval castle was home to a known tyrant and features several hidden passages.

This poignant tribute to the White Rose movement showcases artifacts related to the heroic anti-Nazi struggle.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

The history of radiation is on safe display at the foot of a radiation science laboratory.

This emotive sculpture was originally created for the 1878 World's Fair.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This 18th-century sundial was designed to calculate the date of Easter each year.

The mummified heart of Louis XVII, the lost dauphin of the French Revolution.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

Andrew Carnegie funded the building of almost 3,000 libraries across the world, this was the first.

Did the legendary Scottish knight William Wallace actually take refuge here after a major battle?

Be on the lookout for the symbolic insect all over the city.

This nondescript building hides an entrance to an underground nuclear tunnel system.

Manchester salvaged this sculpture of the adopted Mancunian when it was no longer wanted in Ukraine.

Once used to protect important Roman trade routes.

Discovered on a shipwreck after more than 400 years, this Renaissance ratter tells a very waggly tale.

Hauled from the water's depths, Henry VIII's flagship is preserved in this capsule-shaped museum.

This concrete monster of a wreck lies in the mouth of Langstone Harbour as a monument to the incredible history of D-Day.

A picturesque garden with a surprising past.

The world's largest collection of garden gnomes lives among the trees and wildflowers on this woodland reserve.