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.

This pleasant port town provides a nice, calmer contrast to bustling Rome, so travelers are advised to not simply pass through, but linger and discover more of Civitavecchia. Explore Forte Michelangelo, shop at Corso Centocelle, see the neoclassical Trajan Theatre, and delve into the therapeutic Taurine Baths of Civitavecchia.

Arrowtown, New Zealand, is a quaint town steeped in gold rush history, nestled along the Arrow River in the Otago region. The town’s heritage buildings, many carefully preserved from the 19th century, offer a glimpse into its past as a thriving mining settlement.

Raise a glass and toast Würzburg, an enchanting, Franconian wine-producing area on the Main River, and one of Germany's oldest cities. Wine bars and cellars abound here, but there's also plenty of wonderful history and striking Baroque and rococo architecture to behold.

Vietnam is a country where dramatic landscapes and deep-rooted traditions intertwine, creating a mosaic of experiences that stretch from misty northern mountains to the lush waterways of the Mekong Delta. Its history is marked by ancient kingdoms, colonial legacies, and a remarkable story of resilience in the face of conflict.