David Muir is one of the busiest journalists in the business, helming one of the most watched primetime news shows in the country.MORE: David Muir, Hoda Kotb and Jenna Bush Hager all receive Emmy nominationsBut the ABC star took a step back from World News Tonight to take some time for himself, giving fans a glimpse of his vacation.VIDEO: David Muir's glimpse into his lavish homeHe shared a photograph of himself on Instagram taking in the sun and water in Dubrovnik, Croatia, simply captioning it: "Dubrovnik is magical."He went for the casual look, a black tee showing off his muscular frame with a pair of blue shorts and sunglasses, a departure from his usual on-air sleek suits.MORE: David Muir opens up about childhood and career origin in rare interviewDavid's fans loved seeing the intimate peek into his private life, with colleague and friend Deborah Roberts commenting: "It's my happy place. Enjoy!!"Another of his friends quipped: "Wow….