Big Ben in London, England: You can't visit London without stopping to see one of its most iconic landmarks. The clock tower stands tall over the Houses of Parliament, its chimes marking the passing of time for Londoners for over 150 years. The National Gallery in London, England: With over 2,300 paintings, this art museum boasts some of the world's most famous artworks, including Van Gogh's Sunflowers and da Vinci's Virgin of the Rocks. The Beatles Story Museum and Cavern Club, Liverpool, England: No visit to the UK is complete without experiencing the music of the Beatles. The museum features interactive exhibits and memorabilia, while the Cavern Club hosts live music every night. The Giant's Causeway in Antrim, Northern Ireland: This stunning natural wonder is made up of hexagonal basalt columns and is steeped in Irish legend. Take a scenic walk along the coastline and marvel at this unique geological formation. Edinburgh Castle in Edinburgh, Scotland: This castle has a rich history, from being a royal residence to an army barracks. Take a guided tour to learn about its past and enjoy beautiful views of the city from the top of the hill.