When the Pennsylvania Railroad(now Amtrack)
was built

part of the Lanham Mansion property
along with a stream which feed the property
disappeared.

The stream which ranned from
Goodluck Road along Princess Garden Parkway
still remains

however you will have to stand
along Annapolis Road and Lanham Station Road
too see the stream flow under
concrete and cement (Annapolis Road)

(UN-EDITED MATERIAL)