Hands down, this is one of Amsterdam's must-sees. Along the Singel canal, between Koningsplein and Muntplein, the renowned Flower Market is where blooming wonders are purveyed from permanently moored barges. Besides bouquets of freshly cut flowers, you'll find plants, small trees, bulbs, seeds, and a colorful array of souvenir trinkets. The market is open Monday-Saturday 9:30-5:30, Sunday 11-5:30.
Visit the Travel Talk forums for help on planning your trip