Medieval stone tower on a hill with a clear blue sky in the background, Clifford's Tower, York, North Yorkshire, England, United Kingdom, Europe

Majestic medieval castle on a hill with lush greenery under a clear blue sky, Bamburgh, Northumberland, England, United Kingdom, Europe

Titanium facade of the Guggenheim Museum designed by Frank Gehry, Bilbao, Basque Country, Spain, Europe

Landscape of Athens from the Areopagus, a notable rock outcrop northwest of the Acropolis, Athens, Greece, Europe

Views of waterfall near Grytviken, Swedish for Pot Cove, on South Georgia in the South Atlantic, Polar Regions