The Top 10 Landmarks in the US

The site of Martin Luther King, Jr.'s famous "I Have a Dream" speech, the Lincoln Memorial Reflecting Pool in Washington DC has served as the backdrop for a wide range of historically and culturally significant events. The pool holds nearly 7 million gallons of water and was redesigned in 2012 to be more environmentally friendly. "No visit to DC is complete without a visit to the Lincoln Memorial. Poignant and elegant, it is a must-see stop," commented a TripAdvisor reviewer.

Average Summer bookable rates in Washington DC: June: $307, July: $260, August: $226

Reason to book now: 2016 Memorial Day Parade along Constitution Avenue — May 30, 2016

Top-rated tour: Viator VIP: Best of DC Including US Capitol and National Archives Reserved Access, the White House and Lincoln Memorial — tickets start at $125 per person