The Audubon Aquarium is adjacent to the French Quarter, right on the Mississippi River, which adds to the Aquarium's intrinsically inspiring aura. It displays, among other things, a vibrant world of Caribbean coral reef with a walk-through tunnel, sea otters and penguins engaging in play, and a 400,000 gallon Gulf of Mexico Exhibit which allows you to visit the gigantic sharks, tarpon, and rays. Guests are even encouraged to feed the parakeets, and get up close and personal with a sting ray.

LxFactory is an art centre with a strong industrial feel in the Alcântara district of Lisbon. Located on the grounds of one of the most significant textile factories dating back to mid-19th century, this complex of hipster delights boasts galleries, shops, restaurants and performance spaces. Slightly off the beaten track, but an absolute must-visit if you want to experience the more alternative and young side of Lisbon.

The Botanical Garden of the University of Zürich shows off its broad collection of flora, both local and imported, on the 5.6 hectares that were laid out in the 1970s. Even when it's raining or when it's cold, you can visit the tropical greenhouses. Each glass bubble represents distinct climate: the sweltering humidity of the tropics, the dry heat of the Mediterranean, and the flowering alpine meadows.

The Wonder Cave is the third biggest cave in South Africa. After taking the 90 steps below ground level, you transfer onto an elevator to be lowered another 60 meters underground. See many fossils, rhinestone pools, cave pearls and much more. This is an amazing sight.