Lord Visnu footprint

Information – According to locals, this is believed to be the right footprint of Lord Vishnu, while His left footprint is located in Gaya.
(Author’s Note: We have not found any scriptural references for this particular pastime.)

When the Lord tried to walk, in His small footprints the specific marks of Lord Viṣṇu were visible, namely the flag, thunderbolt, conchshell, disc and fish. Seeing all these marks, neither His father nor His mother could understand whose footprints they were. Thus struck with wonder, they could not understand how those marks could be possible in their home.
(CC Adi 14.7 – 14.8)

The burden of the earth was certainly diminished by the Personality of Godhead and by others as well. When He was present as an incarnation, all good was performed because of His auspicious footprints.
(SB 1.17.26)

Oh the Creator of the Universe, You are our mother, well wisher, Lord, Father, the spiritual master and the worshipable deity. And by following Your footprints we have just become successful in every respect. We pray therefore that You may continue to bless us with Your mercy.
(SB 1.11.7)

You have to follow the footprints of ācārya. Not only in the . . . everywhere, the footprints of ācāryas are followed. Just like in your country you are following the footprints of Lord Jesus Christ. Yes, that is the way. Or any ācārya. Because the ācārya, they come here to teach us about Kṛṣṇa consciousness, or God consciousness. That is their business. They have no other business. That is bona fide ācārya. If somebody claims that “I am God,” then he is fool number one. At once reject him. One who teaches about the message of God, he is ācārya.
(661216 – Lecture BG 09.26-27 – New York)

Because in this age all over the world there will be hopelessness, now this mission should be started from India. That was His prediction. This mission should be started, and the Indians should take responsibility for starting this mission all over the world. And they will be happy. There will be too much unhappiness in this age, and by spreading this mission there will be happiness. That is His prediction. So it is not a manufactured thing. We are just following the footprints of Lord Caitanya. So let us follow it nicely. There will be peace and prosperity all over the world. 
(661224 – Lecture CC Madhya 20.330-335 – New York)

Please tell me whether Akrūra, the son of Śvaphalka, is doing well. He is a faultless soul surrendered unto the Personality of Godhead. He once lost his mental equilibrium due to his ecstasy of transcendental love and fell down on the dust of a road which was marked with the footprints of Lord Kṛṣṇa.
(SB 3.1.32)

In the Haṁsadūta, the following incident is described. The gopīs requested Haṁsadūta to search after the marks of Kṛṣṇa’s lotus feet and to accept them as Lord Brahmā had accepted them on his helmet after he had stolen all Kṛṣṇa’s cowherd boys. Regretting his challenge to Kṛṣṇa, Lord Brahmā had bowed down before the Lord, and his helmet became marked with the footprints of Kṛṣṇa. The gopīs reminded Haṁsadūta that sometimes even the great sage Nārada becomes very ecstatic by seeing these footprints, and sometimes great liberated sages also aspire to see them. “You should therefore seek very enthusiastically to find the footprints of Kṛṣṇa,” they urged. This is another instance of devotional service in compassion.
There is an instance when Sahadeva, the younger brother of Nakula, became greatly gladdened at seeing the effulgent glowing of Kṛṣṇa’s footprints. He began to cry and call out, “Mother Mādrī! Where are you now? Father Pāṇḍu! Where are you now? I am very sorry that you are not here to see these footprints of Kṛṣṇa!” This is another instance of devotional service in compassion.
In devotional service without strong attraction to the Lord, there may sometimes be smiling and other symptoms, but never the stress or lamentation that are symptoms of devotional service in compassion. The basic principle of this compassion is always ecstatic love.
(NOD 47 Compassion and Anger)

gaya-śiraḥ — the place known as Gayā, where Gayāsura took shelter of the lotus feet of Lord Viṣṇu
The sacred lakes like Puṣkara and places where saintly persons live, like Kurukṣetra, Gayā, Prayāga, Pulahāśrama, Naimiṣāraṇya, the banks of the Phālgu River, Setubandha, Prabhāsa, Dvārakā, Vārāṇasī, Mathurā, Pampā, Bindu-sarovara, Badarikāśrama [Nārāyaṇāśrama], the places where the Nandā River flows, the places where Lord Rāmacandra and mother Sītā took shelter, such as Citrakūṭa, and also the hilly tracts of land known as Mahendra and Malaya—all of these are to be considered most pious and sacred. Similarly, places outside India where there are centers of the Kṛṣṇa consciousness movement and where Rādhā-Kṛṣṇa Deities are worshiped must all be visited and worshiped by those who want to be spiritually advanced. One who intends to advance in spiritual life may visit all these places and perform ritualistic ceremonies to get results a thousand times better than the results of the same activities performed in any other place.
(SB 7.14.30-33)