Amsterdam’s De Wallen area is home to one of the world’s most famous red light districts. Take a stroll to soak up the rousing yet beautiful lights, or visit the Red Lights Secrets Museum to learn more about Amsterdam’s sex work profession. The district is also known for its trendy coffee shops, bars, and clubs. The best time to see the district is in the early evening or at night, when the lights begin to illuminate the narrow streets. The area is safe, but it can get very busy, and taking photos or videos of workers is illegal. – Tripadvisor