Some billboards advertise hotels. In Berlin, there is a billboard that IS a hotel.
The blandly named Single Room Hotel houses said room inside a block of billboards. Behind one of the billboards, there’s a stepladder that leads to a cozy abode with an en suite bathroom and a comfortable, if not luxurious, sleeping area. The Single Room hotel is in a gritty area of the city near where the former Berlin Wall ran. At €30 per night, The Single Room hotel might be the best accommodations deal in the whole of the German capital.