These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

The facade of this 16th-century building is decorated with carvings of 300 seashells.

It's a mystery as to why this inland village chose the dolphin as its symbol.

Trimmings from the record-setting tree line that surrounds Cirencester Park have been used to manufacture chemotherapy drugs.

The world's largest sundial can cast a shadow more than 1,600 feet long.

A medieval village holds a very modern hotel.

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

For more than half a millennia, this automaton has rung an hourly bell.

Two large posteriors in one giant statue.

The surviving remnants of a destroyed medieval church now stand in a public park.

Giant topiary dog once played a role in a terrorist bomb plot.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This iconic building was founded as a school for the impoverished, but became one for the sons of the local gentry.

Twice a day this ancient path disappears with the tides, leaving the Holy Island of Lindisfarne out to sea.

The western face was supposedly left clock-less to snub the Welsh.

A rare wooden coffin set vertically into the Gothic arch of an ruined church.

Created as a punny statement about genetic engineering this monstrous hybrid statue has become a beloved icon.

The tower was originally used as a chimney for the waste incinerator of St. John's Precinct and Market.

Gutted during the Liverpool Blitz, this architectural husk has been left destroyed in honor of the dead.

One of the oldest amusement rides in existence was a huge disappointment to its creator.

This device was crucial to the Industrial Revolution development of Leeds.

This network of narrow, medieval passages has the most delightful name.