Lou Fegans

Beautiful church with rotating exhibits. Current exhibit is the history of Indonesia. Interesting but if you are visiting from outsidd Amsterdam it is not a priority.

$7 fee + 2.25 processing fee to enter the gardens from Spring - Fall free in the winter
Must prepurchase tickets online
Plan 1-2hours to explore all of the grounds
Lovely gardens in DC, some areas are better maintained than others. Well worth a visit if you are a local or have visited DC a few times, otherwise I would recommend prioritizing the Smithsonian gardens and Arboretum. The biggest complaint is the significantly limited hours make it challenging to visit (doesn't open until 2:00)

Free museum with relics from ancient America's and Egyt, plan 30min - 1 hour. The real highlight though is the gardens (separate entrance with a fee (must prepurchase tickets online) from Spring - Fall)

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Tranquil water garden with a unique geometric shape. There are four picnic tables in each of the corners with umbrellas that provide lots of shade.