Italy, Lazio, Rome, Vatican City, St Peter's Square, St Peter's Basilica, bronze panels from Door of the Dead.

Italy, Lazio, Rome, Vatican City, St Peter's Square, St Peter's Basilica, bronze door panels.

Italy, Lazio, Rome, Vatican City, St Peter's Square, St Peter's Basilica, bronze door panels.

Italy, Sicily, Taormina, Exterior of ornately decorated house.

Italy, Sicily, Taormina, Ornately painted front door.

Italy, Sicily, Taormina, Ornately decorated house with plants dangling from balcony.

Russia, St Petersburg, Iconostasis door, Church on Spilled Blood, also Church of the Saviour on Spilled Blood.

Power, Alternative, Solar, Roof covered in photovoltaic cell panels.

Power, Alternative, Solar, Roof covered in photovoltaic cell panels.

Iceland, Reykjavik, Glass front exterior of Harpa Concert Hall and Conference Centre.

Iceland, Reykjavik, Glass front exterior of Harpa Concert Hall and Conference Centre.

Iceland, Reykjavik, Glass front exterior of Harpa Concert Hall and Conference Centre.