The Pena palace exemplifies the 19th century Romanticism style of architecture. The palace is a hedonistic mix of vividly painted terraces, decorative battlements and mythological statues, all of which stand at stark contrast to the lush greens of the forests that encircle Pena.

The interior of the palace is equally as fascinating. The forested park lands that surround the palace continue the Romanticism design ideals of the palace, with hidden pathways, ornate features and stunning view points.