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At one time, Apollo boilerplate BP-23 was displayed in Marshall's Rocket Garden. It was moved to the U.S. Space & Rocket Center (I believe some time in 2005), where it is now displayed atop the Saturn V in the Davidson Center for Space Exploration.

Google Maps link to the former location of BP-23.

However, BP-23's sign still stands in the Rocket Garden. It reads

Apollo Launch Escape System & Command Module

This is the Apollo Launch Escape System (LES)/Command Module (CM) boilerplate used in two successful flight tests at White Sands, New Mexico.

These tests, one in 1964, the other in 1965, paved the way for manned Apollo missions. The LES is the forward-most part of the Saturn V and consists of a nose cone Q-ball, a titanium tube tower, and a boost protective cone. The CM is the conically shaped structure and is designed to accommodate three astronauts.