The card with Trakai castle came to me from 13-years old Lithuanian girl Diana. This castle was built in the 14th century and was one of the main centers of the Grand Duchy of Lithuania. 

A stamp with a Lithuanian priest and politician Mykolas Krupavičius (1885-1970)

Cape Hatteras Lighthouse (built in 1870 on Hatteras Island, North Carolina) is the tallest lighthouse in America. I received this card from Molly. She lives with her husband, 2 children and 2 cats in the town of Keene (New Hampshire, USA).