In the Caribbean island nation of Saint Lucia, visitors can drive right through the collapsed caldera of the Soufrière volcano and take a tour of Sulphur Springs geothermal park to see boiling springs and bubbling mud pots. The tour, lasting around 30 minutes, takes visitors safely across a wooden walkway just feet away from the boiling waters. Just outside the park are two bathing pools, one filled with hot black, mineral-rich water and the other, warm water.The park is located...

Near the Jaffa Gate in the Old City of Jerusalem, the public can take tours of the Kishle, a military and prison compound at the Tower of David Museum (Jerusalem, Israel; phone +972 2 6265333, www.tod.org.il/en).Last used in 1947 to house Jewish prisoners during the Israeli War of Independence against the British, the Kishle was recently excavated, revealing retaining walls and a sewage system dating back to the time of Herod as well as graffiti from when it was a British military post.A 2-...

At the Leon Levy Native Plant Preserve on Eleuthera Island, Bahamas, visitors see hundreds of native Bahamian plants plus birds across more than 25 acres. Trails follow themes such as medicinal plants, poisonous plants, mangrove forest and wetlands. The park features a Welcome Center, an Educational Pavilion, a gift shop and the 75-foot Ethan’s Tower with 360-degree views. 

Located on Banks Road, two miles south of the town of Governor’s Harbour, the preserve (phone +...