19. The sleek, 554-foot-tall Beetham Tower in Manchester was completed by SimpsonHaugh and Partners in 2006. The skyscraper's mismatched lines add a sense of movement.
18. The new Switch Building at London's Tate Modern was designed in an eye-catching flame-like shape by Herzog and de Meuron.
17. Conwy Castle on the north coast of Wales is a gorgeous medieval structure that dates back to the early 13th century.
16. Designed by the British architects Chamberlain, Powell and Bon, London's Barbican Centre is known for its symmetrical sharp and curved lines. The Brutalist style buildings comprise the largest performing arts centre in Europe, as well as housing.
15. As punters glide along the River Cam in Cambridge, the stunning, Gothic-style King's College Chapel stands out amid the other university college buildings.
14. King's Cross Station's stunning transformation by John McAslan and Partners includes a giant web-like structure that spreads throughout the train terminal.
13. The Royal Liver Building in Liverpool dates back to 1850, though it was officially completed in 1911. The grand, Grade I-listed building is registered as a UNESCO World Heritage Site.
12. The Convention Centre in Dublin is unmissable. Conceived by Irish architect Kevin Roche, the building has a unique shape, made up of a cube and a giant tube structure tilted toward the river. By night, it looks spectacular next to Santiago Calatrava's Samuel Beckett Bridge.
11. The Sage Centre cuts an unusual shape on the south bank of the River Tyne in Gateshead. Designed by Foster and Partners, the glass and stainless steel concert hall shimmers in the sunlight, and is especially beautiful at sunset.
10. The slide-like Urbis building in Manchester contains the National Football Museum.
9. The remains of St. Andrew's Cathedral in Scotland provide a haunting setting for a brisk walk.
8. The playful Dunmore Pineapple building in Scotland has been entertaining visitors since its creation in 1761.
7. Watch tourists' jaws drop as they look up in the Great Court — designed by Norman Foster — at the British Museum in London.
6. The M by Montcalm building in east London provides an optical illusion that leaves passersby dazzled.
5. Designed by the architect Colin St John Wilson, London's Grade I-listed British Library is home to the world's largest collection of books — and a stunning, sleek interior made up of wavy staircases and sharp lines.
4. The Clyde Auditorium, or "The Armadillo," in Glasgow, Scotland, is the most stylish place to enjoy a concert north of the border.
3. Among London's most beautiful buildings, St. Pancras Renaissance Hotel and King's Cross Clocktower stand out on Euston Road thanks to their striking Gothic Revival facade, designed by the architect George Gilbert Scott.
2. The Royal Pavilion in Brighton ambitiously merges British and Indian culture.
1. The 118-foot-tall zinc roof on the glass-fronted Riverside Museum, designed by Zaha Hadid, makes a startling impression on the shore of the Clyde River in Glasgow.
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