Yes, you can now take package tours of the world's worst (known) nuclear disaster site - Chernobyl, where "this empty landscape, with its occasional eerie ghost town and frozen-in-time buildings, has become Ukraine's most talked-about tourist attraction. With radiation levels having decreased, limited guided tours were begun in 2002." And they are rapidly expanding in popularity. Sunday Observer. See also Kid of Speed; earlier on Archinect; some photographs of "the zone" on BLDGBLOG; and, finally, Chernobyl.info.