During this yearly Welsh swimming race, competitors tread through the fetid waters of a bog trench.

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

At the United Kingdom's only residential library you can sleep among the books.

An odd museum dedicated to French fakes.

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

One of the last umbrella repair shops in Paris upholds the nostalgic art of umbrella making.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

France's national museum of scientific and industrial instruments.