Little vatican
Mount St Sepulchre Franciscan Monastery
This monastery is an odd one. Its founders, in the late nineteenth century, set out to create a Holy Land in America, and commissioned the construction of replicas of overseas holy sites, including the Roman Catacombs, The Grotto of Massabielle in Lourdes, the Grotto of the Nativity, and other assorted reproductions of sites in Jerusalem, Rome, etc. And the grounds beyond those copies are beautiful as well.
National Shrine
This massive, stunning Catholic Basilica is not only the perfect place for any American Catholic to make a pilgrimage; people of any faith will be in awe when they see the sheer size of this church. Anyone interested in architecture will be interested to see how this building was constructed without using any modern methods like structural steel beams and framework, and how it also seamlessly blends architectural styles from different periods over the last 2000 years.
Pope John Paul II Cultural Center
Gallaudet University
Gallaudet is the nation's and the world's first university for the deaf, and remains the world's only university where all classes and services are tailored to the needs of the hearing-impaired. Aside from being the principal institution and center for American Sign Language, the university also comprises a National Historic District, a designation received for its several excellent examples of fanciful North American High Gothic architecture. The most famous of these is the campus' centerpiece, Chapel Hall.