St. Mark's Basilica is a Venice must-see, but usually elbow-to-elbow with crowds. This small-group tour lets you explore after hours in a crowd-free environment with the lights ablaze, so you can fully appreciate the interior. Plus, you get in-depth guided commentary and to visit the usually off-limits crypt, inaccessible to the general public. Upgrade to tour another Venice highlight—the Doge’s Palace and Bridge of Sighs—at a quieter, more peaceful time slot.