In the valley beneath S. Sebastiano are the ruins of the Circus of Maxentius, near those of a villa of that emperor. The circus was 1482 feet long, 244 feet broad, and was capable of containing 15,000 spectators, yet it is a miniature compared with the Circus Maximus, though very interesting as retaining in tolerable preservation all the different parts which composed a circus. The circular ruin near it was a Temple dedicated by Maxentius to his son Romulus.

"Le jeune Romulus, étant mort, fut placé au rang des dieux, dans cet olympe qui s'écroulait. Son père lui éleva un temple dont la partie inférieure se voit encore, et le cirque lui-même fut peut-être une dépendance de ce temple funèbre, car les courses de chars étaient un des honneurs que l'antiquité rendait aux morts, et sont souvent pour cela représentées sur les tombeaux."—Ampère, Emp. ii. 360.

These ruins are very picturesque, backed by the peaks of the Sabine range, which in winter are generally covered with snow.

The opposite hill is crowned by the Tomb of Cecilia Metella, daughter of Quintus Metellus Creticus, and wife of Crassus. It is a round tower, seventy feet in diameter. The bulls' heads on the frieze gave it the popular name of Capo di Bove. The marble coating of the basement was carried off by Urban VIII. to make the fountain of Trevi. The battlements were added when the tomb was turned into a fortress by the Caëtani in the thirteenth century.

"About two miles, or more, from the city gates, and right upon the roadside, is an immense round pile, sepulchral in its original purpose, like those already mentioned. It is built of great blocks of hewn stone, on a vast, square foundation of rough, agglomerated material, such as composes the mass of all the other ruinous tombs. But, whatever might be the cause, it is in a far better state of preservation than they. On its broad summit rise the battlements of a mediæval fortress, out of the midst of which (so long since had time begun to crumble the supplemental structure, and cover it with soil, by means of wayside dust) grow trees, bushes, and thick festoons of ivy. This tomb of a woman has become the dungeon-keep of a castle; and all the care that Cecilia Metella's husband could bestow, to secure endless peace for her beloved relics, only sufficed to make that handful of precious ashes the nucleus of battles, long ages after her death."—Hawthorne, Transformation.

"There is a stern round tower of other days,
Firm as a fortress, with its fence of stone,
Such as an army's baffled strength delays,
Standing with half its battlements alone,
And with two thousand years of ivy grown,
The garland of eternity, where wave
The green leaves over all by time o'erthrown;—
What was this tower of strength? within its cave
What treasure lay so lock'd, so hid?—a woman's grave.

"But who was she, the lady of the dead,
Tomb'd in a palace? Was she chaste and fair?
Worthy a king's—or more—a Roman's bed?
What race of chiefs and heroes did she bear?
What daughter of her beauties was the heir?
How lived—how loved—how died she? Was she not
So honoured—and conspicuously there,
Where meaner relics must not dare to rot,
Placed to commemorate a more than mortal lot?

"Perchance she died in youth: it may be, bow'd
With woes far heavier than the ponderous tomb
That weigh'd upon her gentle dust, a cloud
Might gather o'er her beauty, and a gloom
In her dark eye, prophetic of the doom
Heaven gives its favourites—early death; yet shed
A sunset charm around her, and illume
With hectic light, the Hesperus of the dead,
Of her consuming cheek the autumnal leaf-like red.

"Perchance she died in age—surviving all,
Charms, kindred, children—with the silver grey
On her long tresses, which might yet recall,
It may be, still a something of the day
When they were braided, and her proud array
And lovely form were envied, praised, and eyed
By Rome—but whither would Conjecture stray?
Thus much alone we know—Metella died,
The wealthiest Roman's wife: Behold his love or pride!"
Childe Harold.

Close to the tomb are the ruins of a Gothic church of the Caëtani.