Sweden, Stockholm, Royal Palace guard at sentry box.

Sweden, Stockholm, Royal Palace guard at sentry box.

Israel, The middle terrace of the Herod's Northern Palace at Masada contained a circular reception hall with a pointed roof supported by columns. Ruins of the fortress of Masada in the Judean Desert o...

Italy, Puglia, Bari, Trullo Sovrano, Piazza Sacramento, Alberobello.

Italy, Puglia, Bari, Trullo Sovrano, Piazza Sacramento, Alberobello.

Italy, Puglia, Bari, Conical dry stone rooves of trulli houses, Rione Monti, Alberobello.

Italy, Puglia, Bari, Panoramic view of trulli houses, Alberobello.

Italy, Puglia, Bari, Trullo Sovrano, Piazza Sacramento, Alberobello.

Italy, Puglia, Bari, Trulli buildings and shops, Via Monte San Michele, Rione Monti, Alberobello.

Italy, Puglia, Bari, Trulli buildings and shops, Via Monte San Michele, Rione Monti, Alberobello.

Egypt, Cairo, Giza, Great Pyramid of Giza, also known as Pyramid of Khufu and Pyramid of Cheops.

England, London, Southwark southbank, The Shard skyscraper designed by Renzo Piano in the city's London Bridge Quarter.