There is no mortar used in the construction, the stone blocks are carved to fit together. Beginning in the spring of 1999, tourists were allowed into the tunnels in groups limited to 10 people per tour. I can't imagine that tourists will be allowed in the tunnels for very long. Many items are not protected and can be touched and rubbed against by visitors. Flash photography is not limited.
Locals say the lines to see the tunnels in the high-tourism season can be very long.
The museum mentioned above contains the temple recreation and detailed exterior stone ornaments. It is based mostly upon architecture. There is also a museum in the town of Copan, which displays personal items along the lines of jewelry, clothes, and kitchen items. These pieces are more detailed and have more value. Here are the ornate jade, gold and silver jewelry and adornments.