Words to Describe substructions

How substructions often is described ("________ substructions")

• such
• scattered
• evident
• arched
• solid
• vast
• prodigious
• similar
• deep
• old
• polygonal
• massy
• ponderous
• huge
• massive
• few
• cyclopean
• gigantic
• vaulted
• grand
• mere
• considerable
• noble
• lucullan
• immense
• pillared
• ample
• extensive
• etruscan
• roman
• enormous
• ancient