Explore Peneda-Gerês National Park, Portugal's only national park, with its lush valleys and diverse wildlife. Discover the picturesque Douro Valley, a UNESCO World Heritage Site, known for its terraced vineyards and port wine. Marvel at Sintra’s Pena Palace, a fairy-tale castle showcasing Romantic, Gothic, and Moorish architectural styles. Nearly four years ago, on a sunny day in June, I landed in Lisbon, Portugal. My flight landed just before sunrise at 5:30 a.m., so I couldn't yet get a glimpse of my new home, but while driving in a cab to my new apartment, the sun came up, spreading a dazzling orange and yellow hue across the neoclassical buildings, splashing onto the azulejos (those gorgeous painted tiles) and illuminating what I—now a very biased local—consider to be one of the most exquisite cities in Europe.  However, after a few years of living here, I've come to realize it's not just Lisbon that's so awe-inspiring.…