Historic Edinburgh, capital of Scotland, has so much to offer that you can't possibly do it in a day. The city lies in a beautiful setting, sprawling over an extinct volcano, known as Arthur's Seat, and dominated by the grey, brooding hulk of the Medieval Edinburgh Castle -- the tourist hub of the Royal Mile, a street exactly one Scots mile long. (The outdated measurement is equivalent to 1,807 meters, longer than the standard 1,609-meter mile.) Old Town, as this area is known, features a wonderful labyrinth of alleyways and cobbled streets filled with a castle, museums and churches. After the 1707 Act of Union joined Scotland and England politically, many of Edinburgh's wealthier residents abandoned Edinburgh for London. The Georgian terraces -- individual terraces found on the front of Georgian-style row homes -- of nearby New Town were built in an effort to attract them back. Both Old Town and New Town are part of the city's UNESCO World Heritage Site.