Visit Punakha Dzong

The dzong at the meeting of two rivers, the old winter capital, with jacaranda in spring.

Mongolia’s oldest Buddhist monastery, walled by 108 stupas on the site of Genghis Khan’s capital, Karakorum.

Visit Neuschwanstein Castle, the iconic fairy-tale castle in Bavaria, Germany, that inspired Disney's Sleeping Beauty Castle

Shogun-era castle famous for the pair of golden shachihoko dolphins on its roof and the lavishly rebuilt Honmaru Palace.

Moorish palace-fortress of Granada.

Red-sandstone castle ruin above the old town of Heidelberg and the Neckar valley.

The oldest and largest inhabited castle in the world, the King’s weekend home, with St George’s Chapel and the State Apartments.

Renaissance sea fortress at Helsingor — the Elsinore of Shakespeare’s Hamlet.