This enormous storm barrier is one of the largest moving structures on Earth, with each arm taller than the Washington Monument.

This massive collection of taxidermy is full of specimens collected by missionaries during their international travels.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

This Paris art space celebrates the creativity and ingenuity that springs from abject poverty, especially in Africa.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

In this Parisian garden's grotesque former life as a zoo it fed exotic animals to the bourgeois and put humans on exhibit.

An unusual number plate signifies the building's saucy past.

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

Got apples?

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

A centuries-old forgotten underworld lies beneath Malta.

This unique building in the main square stands out among the city's typically Baroque architecture.

This almost-forgotten underground dungeon housed several convicts over the years, including Caravaggio.

Dynastic Home of the De Piro Family.

Abandoned Roman Catholic chapel abused by Satanists before being restored.

Enigmatic tombs and cave dwellings on the outskirts of a rural village.

The ruins of a megalithic monument sit right in the garden of a luxurious Maltese resort.

Ancient mysterious ruts carved in the bedrock.

The medieval home is still engraved with the symbol of the profession, an eye flanked by two axes.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

The eclectic seaside sanctuary caters to a rather fowl crowd.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."