Challenge Tombs

Tombs are unique locations in Tomb Raider and Rise of the Tomb Raider. Tombs can be found in the hub areas, and are commonly found with markings leading to their entrance. Some tombs will be easily accessible, whereas others will require specific gear in order to gain access, In Rise, some tombs will require dealing with a hostile animal (usually a bear) to gain entrance.

Tombs commonly feature puzzles and treasure or artifacts at the end of the Tomb.

Tomb Raider
Lara can explore the resting places of Yamatai's nobility, as well as ruins of Army Bases which now home the deceased soldiers who never escaped the island. Tombs will feature a physics or elemental based puzzle that must be solved in order to successfully gain the prize at the end.

Completing a tomb will award the player with a map of collectibles or weapon parts.

Tombs
There are seven tombs in game. Eight with the purchase of downloadable content.
 * Tomb of the Unworthy
 * Hall of Ascension
 * Well of Tears
 * Chamber of Judgement
 * Stormguard Sanctum
 * Flooded Vault
 * Temple of the Handmaiden
 * Tomb of the Lost Adventurer (DLC)

Rise of the Tomb Raider
Tombs Return in Rise of the Tomb Raider, now being comprised of collapsed mines, ancient structures of Kitezh and even a ship. Similar puzzles must be solved.

As well as Tombs, there are multiple crypts, which are the final resting places of the Prophet of Constantinople. Crypts do not require a puzzle to be solved, however they should be explored carefully as they are full of booby traps.

Tombs will reward players with a codex, granting Lara specialized skills, whereas crypts will yield bow parts and a quiver.

Tombs
There are nine challenge tombs in game:
 * Ice Ship
 * Ancient Cistern
 * Voice of God
 * The Red Mine
 * House of the Afflicted
 * Baths of Kitezh
 * The Pit of Judgement
 * Catacomb of Sacred Water
 * Chamber of Exorcism

Crypts
There are five crypts in game:
 * The Forge's Crypt
 * The Astronomer's Crypt
 * The Physician's Crypt
 * The Architect's Crypt
 * The Keeper's Crypt

Trivia

 * The tombs in Tomb Raider offering parts for modern weapons as a reward became a joke amongst fans, given that the newest tomb in game at best would not have technology newer than 1945.