Canal tunnel tours, UK

In Dudley, West Midlands, England, visitors can take a subterranean boat tour through a former limestone quarry, seeing fossils embedded in the quarry’s walls (from the area’s distant past as a coral reef) and reconstructions of the once-thriving mine. Tours are aboard one of two boats built in the 1930s.

The 45-minute tour is offered hourly, 10:30 a.m.-3 p.m., Wed.-Sun. £8 (near $10), adult; £7.50, senior, or £6.50, child (3-16). The canal entrance is located at 501 Birmingham New Road, outside of Dudley. Contact Dudley Canal & Tunnel Trust (phone +41 121 557 6265, www.dudleycanaltrust.org.uk).