The United Kingdom

The British Museum in central London is one of the world's great museums and is devoted to human history and culture.

The medieval castle at Conwy is imposing and impressive--as it was meant to be. But its key virtue was location.

All of the surviving castles that King Edward I had built in the late-13th century are impressive. But Caernarfon Castle was designed to be something special.

This was British Prime Minister Winston Churchill's underground command bunker during some of the most dangerous days (and nights) of World War II.

Harlech Castle has stood for 700 years so far. And there's every chance it'll stand guard of this corner of the Welsh coast for at least another 700.

You don't have to be a fan of Downton Abbey to appreciate the beauty of Highclere Castle sitting on a stately hill in the English countryside of Hampshire about two hours west of London.

It's a bit like London's version of the Eiffel Tower--a towering landmark that the city's locals initially greeted with skepticism, relying on some extraordinary engineering, and becoming a iconic fixture of the city's skyline. And both offer unparalleled views of their cities.

Like others of the world's great cities, London really sparkles at night and dusk, making for some beautiful photo opportunities.