On the northern edge of the city, the Norfolk Naval Station is an impressive sight, home to more than 100 ships of the Atlantic Fleet. The base was built on the site of the Jamestown Exposition of 1907; many of the original buildings survive and are still in use. Several large aircraft carriers, built at nearby Newport News, call Norfolk home port and can be seen from miles away, especially at the bridge-tunnel end of the base. You may see two, each with a crew of up to 6,300, beside slightly smaller amphibious carriers that discharge marines in both helicopters and amphibious assault craft. The submarine piers, floating dry docks, supply center, and air station are all worth seeing. The Victory Rover and Carrie B. provide boat tours from downtown Norfolk to the naval station; and Hampton Roads Transit operates tour trolleys most of the year, departing from the naval-base tour office. Visitor access is by tour only, and photo ID is required to enter the base (Note: you will be required to present an additional ID with a state ID from Illinois, Minnesota, Missouri, New Mexico, Washington, and American Samoa).