This remarkable geological formation created by lava flow around 60 million years ago is the top tourist attraction in Northern Ireland, and it's easy to understand why: The 40,000 basalt columns that make up Giant's Causeway truly are a natural wonder, and look like they belong to an alien landscape or a surrealist painting. Oyster's Pick for Where to Stay: Bushmills Inn

Ireland Travel: 10 Attractions You Don't Want to Miss(2 of 10)