Tower of London

Although its exterior might be grim and even unimpressive (especially when compared to stately Buckingham Palace), the Tower of London's interior is always bustling with activity. The Tower, which actually comprises 20 towers, offers something for everyone. If you're enchanted with the history of the monarch, don't miss the famous Crown Jewels exhibition. Among the items you'll see is the Imperial State Crown—which is still worn by the Queen for each State Opening of Parliament—and the Sovereign’s Sceptre with Cross. If you have more than an hour to spend here, take an entertaining tour led by the Yeoman Warders (Tower guards). During the hour-long excursion, the guards will regale you with tales of the Tower's bloody past. Lastly, don't forget to visit the White Tower, an iconic symbol of London's heritage and one of the world's most important historic buildings.

The majority of travelers say the Tower of London's high admission price is worth every pence. And recent visitors recommend attending the 10 p.m. Ceremony of the Keys for an ambient, somewhat creepy experience (imagine all those who were executed in this very place). Remember: You must apply at least two months in advance to attend the ceremony. The Tower of London is open Tuesday through Saturday from 9 a.m. to 5:30 p.m., and Sunday and Monday from 10 a.m. to 5:30 p.m. Adults cost £20.90 GBP (approximately $33 USD) and youths under 16 cost £10.45 GBP (around $17 USD). Children under 5 get in for free. If you want to save 10 percent on admission, consider buying your tickets on the Tower of London's website. You'll find the Tower of London off the Tower Hill Tube stop.