'Worst' Walking Tour, Porto, Portugal
This tour in Portugal's second-largest city is the antithesis of a tourist trap. Avoiding all of Porto's polished postcard-perfect sites, it takes visitors past decrepit homes and crumbling shops. Started by three out-of-work architects who stuck around after the country was hit hard by the recession, The Worst Tours will show you the not-for-tourists sites and guides will tell stories about the old markets and abandoned buildings, helping you understand what's behind Europe's economic crisis. Learn about Porto's architecture, history, politics, and urbanism from a few people who are "OK with not being popular or cool or the best in anything, least of all touring."
Details: Tours are two to three hours and are free.
Insider Tip: Let your guide know which parts of the city you've already visited and what your interests are, and he or she will create a route that shows you things you haven't seen.