More than thirty bookstores, many specializing in out of print or hard to locate titles, lure literary lovers to this market town of 2000, known as the Town of Books. Snugly nestled in the County of Powys at the English border, Hay-on-Wye is most popular during the annual Guardian Hay Festival during the last few weeks of May, when 80,000 visitors descend for readings and seminars. Hay-on-Wye, or Y Gelli as it is in Welsh, also has two Norman castles, a plethora of pubs and a pleasant stream.

The Welsh capital may have begun its life as a Roman fort, but it's since become a bustling city. Where the fort once stood, Cardiff Castle has held court since the 11th century. It remains a central presence in the city, now full of lively art and music venues, hip boutiques, fun bars and modern hotels. Even with so many new and exciting things to see, the National History Museum is still the most visited attraction in Wales. Don't be the only visitor who plays hooky!

Cheltenham was just your average, sleepy town until the discovery of a spring in 1716, after which it became Britain's most popular spa town. (Like Palm Springs without the casinos.) Local Cheltonians have a reputation for being wealthy and respectable, and a walk along the Promenade will give you a first-class view of their wonderful houses, shops and gardens. After taking in the waters at the Pittville Pump Room (great name for a spa), check out the Art Gallery and Museum to learn about the social history of Cheltenham.

So-called because of the honey-coloured stone used to build its villages, the Cotswolds offers visitors the quintessential English experience. The area spans five counties and boasts some of England’s most impressive country houses, castles, and landscapes. Plus, plentiful pubs make it easy to experience authentic English hospitality.

Make sure to pack your wellies, because Snowdonia National Park is one of the wettest spots in the U.K. Besides being soggy, it’s also pretty impressive. A fairly easy hike takes you to the top of Yr Wyddfa, the highest peak in Wales (topping any peaks in England, too), where peregrine falcons nest in the jagged cliffs. The park also has the largest lake in Wales, Llyn Tegid. It has its own Loch Ness-style monster—called Teggie, of course—though some figure it’s just an unusually large pike. This Snowdonia’s wonders can also be found on a smaller scale. Keep an eye out for the Snowdon beetle, which has rainbow stripes down its back.