Almudena Cathedral - Full name Catedral de Santa María la Real de La Almudena. Work on the Roman Catholic cathedral amazingly didn't begin until 1879 and was finished and consecrated by Pope John Paul II in
Ice cave in the Skaftafell National Park in Iceland. Ice caves collapse and new ones form as each glacier grinds slowly towards the sea. Local guides can help you (without dying) find one. (Visit Skaftafell National Park in Iceland.