A cave developed for visitors is called a show cave, and the good ones manage to be accessible without being diminished. These twelve have walkways, guides and lighting, and are…
Standing behind falling water is a truly strange sensation: the noise, the light coming through the curtain, the cold air pushed out by the fall. The geology that produces it…
Canyons are slow arguments between rock and water, and the winner is always the water given enough time. What varies is the rock, the climate and how long the argument…
Hot springs occur where groundwater meets heat from the Earth's interior and returns to the surface, which is why they cluster along volcanic belts and fault lines. What differs enormously…
The great railway stations were built to impress, at a moment when rail travel was new and cities were competing to announce their arrival. Most airports have never attempted anything…
Bridges are the most public form of engineering there is: you can see the whole argument at once, and you find out immediately whether it worked. These fourteen are worth…