Lonely Planet Secret Marvels of the World

Featuring communist bunkers, burning gas craters and at least one sponge-rock fluorescent grotto built by Polish monks, this book reveals weird and wonderful sights the crowds don\'t reach.
This packed and fascinating title takes its readers on a journey through the world\'s lesser known marvels. Dive into an underworld of the planet\'s most surprising, fun, perplexing, kitsch and downright bizarre sights - and explore human stories and mysterious happenings that you won\'t find inside a regular guidebook.