Reims Cathedral, Roof

Reims Cathedral sustained some serious damage in WWI, including the burning of its roof. After the war, John D. Rockefeller, Jr., financed its rebuilding, this time not with timber but with concrete framing (and lead on top). There is thus far less a danger of fire now, and tours climb up the 250 steps of the south tower, into a terrace, then on catwalks between the ceiling and roof, then outside all the way around the transepts, back inside, and then back down the tower. An amazing, not-to-be-missed experience.