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.

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.

>Estonia, a hidden gem in Northern Europe, boasts a fascinating mix of medieval charm and modern vibrancy. The capital city, Tallinn, is renowned for its well-preserved medieval Old Town, a UNESCO World Heritage Site. Wander through the cobbled streets of the Old Town, where you’ll encounter stunning Gothic architecture, including the impressive Alexander Nevsky Cathedral and the Town Hall, with its ornate spire and charming square.

The Valley of the Kings and the Valley of the Queens, located on the west bank of the Nile near Luxor, Egypt, are two of the world’s most significant archaeological sites. For over 500 years during the New Kingdom (16th–11th centuries BCE), these valleys served as the burial grounds for pharaohs, queens, and high-ranking nobles.

Maseru, the capital of Lesotho, sits along the banks of the Caledon River near the border with South Africa. As the political and economic center of the country, it offers a mix of modern amenities, government offices, and bustling markets.