Perot Museum of Nature and Science

Thom Mayne's cube with the escalator outside

Complete fossilized skeleton of a Columbian mammoth displayed horizontally on platform — Gary Todd · Public domain

Small prehistoric bear-like predator skeletal mount showing skull and full bone structure — Gary Todd · Public domain

Skeletal fossil mount of a compact prehistoric carnivore with prominent jaw and teeth — Geekgecko · CC BY 4.0

Large pterosaur skeleton suspended in flight pose with extended wing span overhead — Geekgecko · CC BY 4.0

A good science museum in a genuinely strange building, with a glass escalator running up the outside of a concrete cube.

Sources (1)

Perot Museum — official