ZERO-STAR HOTEL: Swiss artists Frank and his twin-brother Patrik Riklin (R) pose in their Null-Stern-Hotel (Zero-star-hotel) land art installation on an alp in front of the peak of mount Saentis near Gonten, Switzerland. Guests can order overnight stays in the Null-Stern-hotelroom with no walls and roof located on some 1,200 metres (3,937 ft) altitude in the eastern Swiss Alps. — Reuters