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Although the words train and locomotive may seem interchangeable, they are two distinct things. A train is typically a transport vehicle made up of a series of railcars . The locomotive—or engine as it's also known—is what provides, well…the locomotion. When trains were invented, the power needed to haul them was generated from steam engines. Later, other energy sources were used, including kerosene, diesel, gasoline, and electricity. Locomotive-hauled trains have ruled the rails for centuries but self-propelled multiple-unit trains are catching up. These are trains where the locomotion components are located on each railcar, and they're gaining lots of traction—especially as high-speed passenger rail .

Good communication is important in relationships: Just ask these seabirds who are known to mate for life, often a span of two or three decades. While the call of the Atlantic puffin isn't the most romantic sound (think something between a hearty laugh and an armpit noise), that's just one way these highly social birds share their feelings. Males perform mating dances for females, and mating pairs often trade low grunts and chirps, sometimes rubbing their bills together affectionately.

At over 6,000 feet above sea level, and located in the Valley of the Ten Peaks, Moraine Lake is one of the highlights of Alberta, Canada’s immense Banff National Park. Fed by Fay Glacier, this high alpine lake takes on what seems an impossibly brilliant turquoise hue in daytime. The explanation? Rock flour. It’s what results when glaciers crush their way across rocks as they migrate. A suspension of these rock particles in meltwater runoff – called glacial milk – then flows into the lake and creates an incredibly vivid tint . Still, we like to think Moraine Lake is at least as beautiful under the starry nighttime sky.

El Jadida is also called the Cité Portugaise. It’s not just a fanciful name: The Moroccan city was under Portuguese rule from 1502 to 1769. This now-defunct cistern within the Fortress of Mazagan is a great example of the Portuguese style that still characterizes much of the town’s architecture. With one opening in the ceiling to allow natural light to illuminate the well, the rest of the cistern is lit artificially, so that visitors can see its ornate arches. The pillars are reflected in an ever-present shallow layer of water on the cistern’s floor. (Just lend us a pair of waterproof boots and we’re there.)

Popular for its Football team Dallas Cowboys and sporty spirit, this city is a perfect blend of modern architecture and rich heritage. Aside from being a shopping and financial hub, Dallas has a thriving music scene and is also a hotspot for cultural activities including opera, ballet, musicals, and symphony concerts. Official Home of the Frozen Margarita, this place is a total delight for Cocktail nerds. Popular destinations include the Dallas Museum of Art, The Dallas Arboretum and Botanical Garden, and a 212-acre gigantic theme park Six Flags Over Texas.