Hidden in the northern region of Costa Rica, the Celeste River (Río Celeste) winds through Tenorio Volcano National Park with a color so vivid it seems unreal. The river’s striking turquoise hue is caused by a natural chemical reaction between two mineral-rich streams, Quebrada Agria and Río Buena Vista, which merge at a point known as "El Teñidero." This one-of-a-kind phenomenon creates the illusion that the water has been dyed blue, even though no pigments are present.

Las Vegas, Nevada, is an electrifying city where glitz and glamour meet entertainment and excitement. Known as "The Entertainment Capital of the World," Las Vegas offers an unparalleled array of attractions, from its iconic casinos and luxurious hotels to its world-class dining and live shows. The city's entertainment scene is second to none, featuring legendary headliners, cutting-edge performances, and an array of themed attractions.

New York City is a city that pulses with movement, sound, and stories at every corner. Whether it's the echo of footsteps under Grand Central Terminal’s iconic ceiling or the quiet shuffle of chess pieces in Washington Square Park, every detail is part of a larger rhythm. New York’s cultural offerings are unmatched in scope. A single day could include a visit to the Museum of Modern Art, a Broadway matinee, and live jazz at an underground club in the Village.

Cairns is the majestic entrance to Australia's Great Barrier Reef. This warm, tropical destination is located in Far North Queensland. Must-see attractions in Cairns include the Tjapukai Aboriginal Cultural Park, which educates tourists about indigenous peoples, and restaurant and bar-dotted Cairns Esplanade, which has a lagoon for swimming.

Whether you are in D.C. on business or vacation, you'll find that it's a fascinating city that is full of history, art, theatre, and dramatic monuments.