In Las Palmas, Gran Canaria, in Spain's Canary Islands, the Poema del Mar aquarium (Sanapú Dock, Las Palmas; phone +34 928 010 350, www.poema-del-mar.com/index.php/en) opened in January 2018.

Its centerpiece is a tank with the world's largest curved window — 118 feet wide, 24 feet tall and more than a foot thick. The tank contains nearly 1,500,000 gallons of seawater and 3,000 specimens of 40 different species, such as rays and rarely exhibited bull sharks and sand tiger...

In Cambrils, south of Barcelona, both native and Caribbean plants and a menagerie of Caribbean birds can be found at Parc Samá (Carretera de Vinyols s/n, 43850 Cambrils, Tarragona, Spain; phone +34 977 82 65 14, www.parquesama.com/parc-sama-eng).

Comprising a garden, forest, lake and palace, Parc Samá was built in 1881 by Salvador Samá Torrents, a marqués of Cuba, as a holiday home that would reflect his former life in Cuba. Famed Modernist Spanish architects Josep Fontseré and...

On the island of Île Petite Grenade, in the French overseas territory of Martinique, guests can spend the night stargazing in a transparent, round sleeping pod at Le Domaine des Bulles (Propriété Benguette, Petite Grenade, 97280 Le Vauclin, Martinique; phone +596 74 69 54, www.ledomainedesbulles.com). A queen-sized bed, table and chairs fit within each air-conditioned pod, situated in a private enclosure with a separate bathroom/shower.

Three kinds of pods are available (rates, higher...